diff --git a/pixi.lock b/pixi.lock
index 50a6ed09..dc42997d 100644
--- a/pixi.lock
+++ b/pixi.lock
@@ -32,6 +32,7 @@ environments:
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+      - pypi: https://files.pythonhosted.org/packages/fd/41/bc2df86b72965775f6d621e0ee269a5f3ac23e8f870abf519de9c7d93b4d/h5py-3.13.0-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
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@@ -85,6 +86,7 @@ environments:
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       - pypi: https://files.pythonhosted.org/packages/fe/5e/3be305568fe5f34448807976dc82fc151d76c3e0e03958f34770286278c1/flexparser-0.4-py3-none-any.whl
+      - pypi: https://files.pythonhosted.org/packages/fd/41/bc2df86b72965775f6d621e0ee269a5f3ac23e8f870abf519de9c7d93b4d/h5py-3.13.0-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
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@@ -165,6 +167,7 @@ environments:
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+      - pypi: https://files.pythonhosted.org/packages/fd/41/bc2df86b72965775f6d621e0ee269a5f3ac23e8f870abf519de9c7d93b4d/h5py-3.13.0-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
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+      - pypi: https://files.pythonhosted.org/packages/fd/41/bc2df86b72965775f6d621e0ee269a5f3ac23e8f870abf519de9c7d93b4d/h5py-3.13.0-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
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@@ -375,10 +379,11 @@ packages:
   requires_python: '>=3.8'
 - pypi: .
   name: cditools
-  version: 0.1.dev11+g9b82aa1.d20250429
-  sha256: 19ea9cb2d7ea3b19fc923f9299e5733b3f98028dea1cf4fb9467ba41ac960810
+  version: 0.1.dev18+g22d45e0.d20250515
+  sha256: 2a690b8e82f56c90db4126ff52415e1fca013a04ccaa3f4e60594e428a8b7b74
   requires_dist:
   - ophyd
+  - h5py
   - pytest>=6 ; extra == 'test'
   - pytest-cov>=3 ; extra == 'test'
   - caproto[standard]>=0.4.2rc1,!=1.2.0 ; extra == 'test'
@@ -512,6 +517,13 @@ packages:
   - sphinx-basic-ng>=1.0.0b2
   - pygments>=2.7
   requires_python: '>=3.8'
+- pypi: https://files.pythonhosted.org/packages/fd/41/bc2df86b72965775f6d621e0ee269a5f3ac23e8f870abf519de9c7d93b4d/h5py-3.13.0-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
+  name: h5py
+  version: 3.13.0
+  sha256: be949b46b7388074c5acae017fbbe3e5ba303fd9daaa52157fdfef30bbdacadd
+  requires_dist:
+  - numpy>=1.19.3
+  requires_python: '>=3.9'
 - pypi: https://files.pythonhosted.org/packages/2b/d3/85feeba1d097b81a44bcffa6a0beab7b4dfffe78e82fc54978d3ac380736/identify-2.6.10-py2.py3-none-any.whl
   name: identify
   version: 2.6.10
diff --git a/pyproject.toml b/pyproject.toml
index 98908745..d9a1fc14 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,7 +30,8 @@ classifiers = [
 ]
 dynamic = ["version"]
 dependencies = [
-  "ophyd"
+  "ophyd",
+  "h5py",
 ]
 
 [project.optional-dependencies]
diff --git a/src/cditools/eiger.py b/src/cditools/eiger.py
new file mode 100644
index 00000000..5614d875
--- /dev/null
+++ b/src/cditools/eiger.py
@@ -0,0 +1,179 @@
+from __future__ import annotations
+
+from datetime import datetime
+from pathlib import Path, PurePath
+from typing import Any
+
+from ophyd import Component as Cpt  # type: ignore[import-not-found]
+from ophyd import (
+    Device,
+    EigerDetector,
+    EpicsSignalRO,
+    ProcessPlugin,
+    ROIPlugin,
+    StatsPlugin,
+    StatusBase,
+)
+from ophyd.areadetector.base import (  # type: ignore[import-not-found]
+    ADComponent,
+    EpicsSignalWithRBV,
+)
+from ophyd.areadetector.filestore_mixins import (  # type: ignore[import-not-found]
+    FileStoreBase,
+    new_short_uid,
+)
+from ophyd.areadetector.trigger_mixins import (  # type: ignore[import-not-found]
+    SingleTrigger,
+)
+
+
+class EigerFileHandler(Device, FileStoreBase):
+    """A device to handle the file writing for the Eiger detector.
+
+    When the Eiger's FileWriter module and SaveFiles are enabled, the file writing is handled
+    by the detector itself. In this case, we want to generate a resource document for the
+    file path and file name pattern. Then, we want to generate a datum for each trigger that
+    enables us to get the individual frames from the file.
+
+    The alternative to this is to use the Stream interface and configure the area detector plugins
+    to write to a file store.
+    """
+
+    sequence_id = ADComponent(EpicsSignalRO, "SequenceId")
+    file_path = ADComponent(EpicsSignalWithRBV, "FilePath", string=True)
+    file_write_name_pattern = ADComponent(
+        EpicsSignalWithRBV, "FWNamePattern", string=True
+    )
+    file_write_images_per_file = ADComponent(EpicsSignalWithRBV, "FWNImagesPerFile")
+    enable = Cpt(EpicsSignalWithRBV, "FWEnable")
+    data_source = Cpt(EpicsSignalWithRBV, "DataSource", string=True)
+    save_files = Cpt(EpicsSignalWithRBV, "SaveFiles")
+
+    def __init__(self, *args: Any, **kwargs: dict[str, Any]) -> None:
+        self.sequence_id_offset = 1
+        super().__init__(*args, **kwargs)
+
+        # NOTE: See `FileStoreBase._generate_resource` for the use of these.
+        self._fn = None
+        self.filestore_spec = "AD_EIGER"
+        self._master_file_paths: list[PurePath] = []
+
+    @property
+    def master_file_paths(self) -> list[PurePath]:
+        if len(self._master_file_paths) == 0:
+            msg = "Master file path has not been set. Call stage() first."
+            raise ValueError(msg)
+        return self._master_file_paths
+
+    @property
+    def sequence_number(self) -> int:
+        return self.sequence_id_offset + int(self.sequence_id.get())
+
+    def stage(self) -> list[object]:
+        res_uid = new_short_uid()
+        write_path = Path(f"{datetime.now().strftime(self.write_path_template)}/")
+        self.file_path.set(write_path.as_posix()).wait(1.0)
+
+        # The name pattern must have `$id` in it.
+        # `$id` is replaced by the current sequence id of the acquisition.
+        # E.g. * <res_uid>_1_master.h5
+        #      * <res_uid>_1_data_000001.h5
+        #      * <res_uid>_1_data_000002.h5
+        #      * ...
+        self.file_write_name_pattern.set(f"{res_uid}_$id").wait(1.0)
+
+        ret: list[object] = super().stage()
+
+        # Set the filename for the resource document.
+        file_prefix = PurePath(self.file_path.get()) / res_uid
+        self._fn = file_prefix
+
+        images_per_file = self.file_write_images_per_file.get()
+        resource_kwargs = {"images_per_file": images_per_file}
+
+        self._generate_resource(resource_kwargs)
+
+        # Validate that the root path exists
+        if not Path.exists(Path(self.reg_root)):
+            msg = f"Root path {self.reg_root} does not exist"
+            raise FileNotFoundError(msg)
+
+        # Create the templated part of the path
+        if not Path.exists(write_path):
+            Path.mkdir(write_path, parents=True)
+
+        # Reset the list of master file paths
+        self._master_file_paths = []
+
+        return ret
+
+    def generate_datum(
+        self, key: str, timestamp: float, datum_kwargs: dict[str, Any]
+    ) -> Any:
+        # The detector keeps its own counter which is uses label HDF5
+        # sub-files.  We access that counter via the sequence_id
+        # signal and stash it in the datum.
+        datum_kwargs.update({"seq_id": self.sequence_number})
+        self._master_file_paths.append(
+            PurePath(f"{self._fn}_{self.sequence_number}_master.h5")
+        )
+        return super().generate_datum(key, timestamp, datum_kwargs)
+
+
+class EigerBase(EigerDetector):
+    """Base class for Eiger detectors that have the commonly used plugins."""
+
+    file_handler = Cpt(
+        EigerFileHandler,
+        "cam1:",
+        name="file_handler",
+        # TODO: These paths need to be changed once the detector is deployed at CDI.
+        write_path_template="/nsls2/data/tst/legacy/mock-proposals/2025-2/pass-56789/assets/eiger/%Y/%m/%d",
+        root="/nsls2/data/tst/legacy/mock-proposals/2025-2/pass-56789/assets/eiger",
+    )
+    stats1 = Cpt(StatsPlugin, "Stats1:")
+    stats2 = Cpt(StatsPlugin, "Stats2:")
+    stats3 = Cpt(StatsPlugin, "Stats3:")
+    stats4 = Cpt(StatsPlugin, "Stats4:")
+    stats5 = Cpt(StatsPlugin, "Stats5:")
+    roi1 = Cpt(ROIPlugin, "ROI1:")
+    roi2 = Cpt(ROIPlugin, "ROI2:")
+    roi3 = Cpt(ROIPlugin, "ROI3:")
+    roi4 = Cpt(ROIPlugin, "ROI4:")
+    proc1 = Cpt(ProcessPlugin, "Proc1:")
+
+    def stage(self, *args: Any, **kwargs: dict[str, Any]) -> list[object]:
+        staged_devices: list[object] = super().stage(*args, **kwargs)
+        self.cam.manual_trigger.set(True).wait(5.0)
+        file_write_path = self.file_handler.file_path.get()
+        if not Path.exists(file_write_path):
+            msg = f"Path {file_write_path} does not exist."
+            raise FileNotFoundError(msg)
+        return staged_devices
+
+    def unstage(self) -> None:
+        self.cam.manual_trigger.set(False).wait(5.0)
+        super().unstage()
+
+        if not all(Path.exists(path) for path in self.file_handler.master_file_paths):
+            msg = f"Paths {self.file_handler.master_file_paths} were not written."
+            raise FileNotFoundError(msg)
+
+
+class EigerSingleTrigger(SingleTrigger, EigerBase):
+    """Eiger detector that uses the single trigger acquisition mode."""
+
+    def __init__(self, *args: Any, **kwargs: dict[str, Any]) -> None:
+        super().__init__(*args, **kwargs)
+        self.stage_sigs["cam.trigger_mode"] = 0
+        self.stage_sigs["file_handler.data_source"] = "FileWriter"
+        self.stage_sigs["file_handler.enable"] = True
+        self.stage_sigs["file_handler.save_files"] = True
+
+    def trigger(self, *args: Any, **kwargs: dict[str, Any]) -> StatusBase:
+        status = super().trigger(*args, **kwargs)
+        # If the manual trigger is enabled, we need to press the special trigger button
+        # to actually trigger the detector.
+        if self.cam.manual_trigger.get() == 1:
+            self.cam.special_trigger_button.set(1).wait(5.0)
+        return status