diff --git a/src/NexusReader.Application/Abstractions/Services/IEpubReader.cs b/src/NexusReader.Application/Abstractions/Services/IEpubReader.cs
new file mode 100644
index 0000000..d1790f2
--- /dev/null
+++ b/src/NexusReader.Application/Abstractions/Services/IEpubReader.cs
@@ -0,0 +1,9 @@
+using FluentResults;
+using NexusReader.Application.Queries.Reader;
+
+namespace NexusReader.Application.Abstractions.Services;
+
+public interface IEpubReader
+{
+    Task<Result<ReaderPageViewModel>> GetEpubContentAsync(int chapterIndex, string? userId = null);
+}