diff --git a/ArcFormats/Succubus/ImageGH.cs b/ArcFormats/Succubus/ImageGH.cs
new file mode 100644
index 00000000..2e964ab3
--- /dev/null
+++ b/ArcFormats/Succubus/ImageGH.cs
@@ -0,0 +1,105 @@
+//! \file       ImageGH.cs
+//! \date       2017 Dec 26
+//! \brief      Succubus image format.
+//
+// Copyright (C) 2017 by morkt
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+
+using System.ComponentModel.Composition;
+using System.IO;
+
+namespace GameRes.Formats.Succubus
+{
+    internal class GhpMetaData : ImageMetaData
+    {
+        public int  Colors;
+        public uint PaletteOffset;
+        public uint DataOffset;
+    }
+
+    [Export(typeof(ImageFormat))]
+    public class GhFormat : ImageFormat
+    {
+        public override string         Tag { get { return "GH"; } }
+        public override string Description { get { return "Succubus image format"; } }
+        public override uint     Signature { get { return 0x33504847; } } // 'GHP3'
+
+        public override ImageMetaData ReadMetaData (IBinaryStream file)
+        {
+            var header = file.ReadHeader (0x28);
+            return new GhpMetaData {
+                Width = header.ToUInt16 (0xC),
+                Height = header.ToUInt16 (0xE),
+                BPP = 8,
+                Colors = header.ToUInt16 (0x10),
+                PaletteOffset = header.ToUInt32 (0x18),
+                DataOffset = header.ToUInt32 (0x24),
+            };
+        }
+
+        public override ImageData Read (IBinaryStream file, ImageMetaData info)
+        {
+            var reader = new Ghp3Reader (file, (GhpMetaData)info);
+            reader.Unpack();
+            return ImageData.Create (info, reader.Format, reader.Palette, reader.Data, reader.Stride);
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("GhFormat.Write not implemented");
+        }
+    }
+
+    internal class Ghp3Reader
+    {
+        IBinaryStream       m_input;
+        GhpMetaData         m_info;
+        byte[]              m_output;
+
+        public PixelFormat    Format { get { return PixelFormats.Indexed8; } }
+        public BitmapPalette Palette { get; private set; }
+        public int            Stride { get { return m_stride; } }
+        public byte[]           Data { get { return m_output; } }
+
+        public Ghp3Reader (IBinaryStream input, GhpMetaData info)
+        {
+            m_input = input;
+            m_info = info;
+            m_stride = ((int)info.Width + 3) & ~3;
+        }
+
+        public void Unpack ()
+        {
+            m_input.Position = m_info.PaletteOffset;
+            Palette = ImageFormat.ReadPalette (m_input.AsStream, m_info.Colors, PaletteFormat.Bgr);
+            m_input.Position = m_info.DataOffset;
+            int image_size = (m_stride * (int)m_info.Height + 0x1F) & ~0x1F;
+            int table_size = image_size >> 3;
+            var rows_table = new int[m_info.Height];
+            for (uint i = 0; i < info.Height; ++i)
+            {
+                int line_pos = i * m_stride;
+                uint y = m_info.Height - i;
+                rows_table[y - 1] = line_pos;
+            }
+        }
+    }
+}