diff --git a/src/book.rs b/src/book.rs
index 4a9ec98..b834ef2 100644
--- a/src/book.rs
+++ b/src/book.rs
@@ -310,6 +310,12 @@ pub fn load_epub(path: impl AsRef<Path>) -> Result<Book, String> {
         .cloned()
         .collect();
 
+    let spine_paths: Vec<String> = spine.iter().map(|id| {
+        doc.resources.get(id)
+            .map(|(path, _)| path.to_string_lossy().to_string())
+            .unwrap_or_else(|| id.clone())
+    }).collect();
+
     let mut sections = Vec::new();
     for (i, href) in spine.iter().enumerate() {
         let raw_html = doc.get_resource_str(href)
@@ -326,7 +332,7 @@ pub fn load_epub(path: impl AsRef<Path>) -> Result<Book, String> {
     }
 
     let raw_toc = std::mem::take(&mut doc.toc);
-    let toc = build_toc(&raw_toc, &spine);
+    let toc = build_toc(&raw_toc, &spine, &spine_paths);
 
     Ok(Book { title, author, cover, layout, sections, toc })
 }
@@ -351,8 +357,8 @@ fn extract_title(html: &str) -> Option<String> {
 }
 
 fn extract_filename(path: &str) -> &str {
-    let path = path.trim_end_matches('/');
-    path.rsplit('/').next().unwrap_or(path)
+    let path = path.trim_end_matches('/').trim_end_matches('\\');
+    path.rsplit(&['/', '\\'][..]).next().unwrap_or(path)
 }
 
 fn extract_fragment(path: &str) -> Option<String> {
@@ -371,6 +377,7 @@ fn extract_fragment(path: &str) -> Option<String> {
 fn build_toc(
     entries: &[epub::doc::NavPoint],
     spine: &[String],
+    spine_paths: &[String],
 ) -> Vec<TocEntry> {
     entries
         .iter()
@@ -378,20 +385,29 @@ fn build_toc(
             let content_str = e.content.to_string_lossy();
             let anchor = extract_fragment(&content_str);
             let content_file = extract_filename(&content_str);
-            let section = spine
+            let section = spine_paths
                 .iter()
                 .position(|s| {
                     let spine_file = extract_filename(s);
-                    spine_file == content_file
-                        || content_str.contains(s.as_str())
-                        || s.contains(content_str.as_ref())
+                    if spine_file == content_file {
+                        return true;
+                    }
+                    content_str.contains(s.as_str()) || s.contains(content_str.as_ref())
+                })
+                .or_else(|| {
+                    spine.iter().position(|s| {
+                        let spine_file = extract_filename(s);
+                        spine_file == content_file
+                            || content_str.contains(s.as_str())
+                            || s.contains(content_str.as_ref())
+                    })
                 })
                 .unwrap_or(0);
             TocEntry {
                 label: e.label.clone(),
                 section,
                 anchor,
-                children: build_toc(&e.children, spine),
+                children: build_toc(&e.children, spine, spine_paths),
             }
         })
         .collect()
@@ -521,7 +537,7 @@ mod tests {
 
     #[test]
     fn test_build_toc_empty() {
-        let toc = build_toc(&[], &[]);
+        let toc = build_toc(&[], &[], &[]);
         assert!(toc.is_empty());
     }
 
@@ -561,7 +577,7 @@ mod tests {
                 children: vec![],
             },
         ];
-        let toc = build_toc(&nav_points, &spine);
+        let toc = build_toc(&nav_points, &spine, &spine);
         assert_eq!(toc.len(), 1);
         assert_eq!(toc[0].section, 1); // maps to spine index 1
         assert_eq!(toc[0].label, "Chapter 2");
@@ -582,7 +598,7 @@ mod tests {
                 children: vec![],
             },
         ];
-        let toc = build_toc(&nav_points, &spine);
+        let toc = build_toc(&nav_points, &spine, &spine);
         assert_eq!(toc.len(), 1);
         assert_eq!(toc[0].section, 0);
     }