diff --git a/src/components/series/SeriesHeader.tsx b/src/components/series/SeriesHeader.tsx
index 57e3835..6f8dd27 100644
--- a/src/components/series/SeriesHeader.tsx
+++ b/src/components/series/SeriesHeader.tsx
@@ -1,6 +1,6 @@
 "use client";
 
-import { Book, BookOpen, BookMarked, Star, StarOff, User } from "lucide-react";
+import { Book, BookOpen, BookMarked, BookX, Star, StarOff, User } from "lucide-react";
 import type { NormalizedSeries } from "@/lib/providers/types";
 import { useState, useEffect } from "react";
 import { useToast } from "@/components/ui/use-toast";
@@ -160,6 +160,11 @@ export const SeriesHeader = ({ series, refreshSeries, initialIsFavorite }: Serie
                   ? t("series.header.books", { count: series.bookCount })
                   : t("series.header.books_plural", { count: series.bookCount })}
               </span>
+              {series.missingCount != null && series.missingCount > 0 && (
+                <StatusBadge status="warning" icon={BookX}>
+                  {t("series.header.missing", { count: series.missingCount })}
+                </StatusBadge>
+              )}
               <IconButton
                 variant="ghost"
                 size="icon"
diff --git a/src/components/ui/series-cover.tsx b/src/components/ui/series-cover.tsx
index fe8cb97..a606feb 100644
--- a/src/components/ui/series-cover.tsx
+++ b/src/components/ui/series-cover.tsx
@@ -1,4 +1,5 @@
 import { ProgressBar } from "./progress-bar";
+import { BookX } from "lucide-react";
 import type { SeriesCoverProps } from "./cover-utils";
 
 export function SeriesCover({
@@ -12,6 +13,7 @@ export function SeriesCover({
   const readBooks = series.booksReadCount;
   const totalBooks = series.bookCount;
   const showProgress = Boolean(showProgressUi && totalBooks > 0 && readBooks > 0 && !isCompleted);
+  const missingCount = series.missingCount;
 
   return (
     <div className="relative w-full h-full">
@@ -27,6 +29,12 @@ export function SeriesCover({
           .filter(Boolean)
           .join(" ")}
       />
+      {showProgressUi && missingCount != null && missingCount > 0 && (
+        <div className="absolute top-1.5 right-1.5 flex items-center gap-0.5 rounded-full bg-orange-500/90 px-1.5 py-0.5 text-white shadow-md backdrop-blur-sm">
+          <BookX className="h-3 w-3" />
+          <span className="text-[10px] font-bold leading-none">{missingCount}</span>
+        </div>
+      )}
       {showProgress ? <ProgressBar progress={readBooks} total={totalBooks} type="series" /> : null}
     </div>
   );
diff --git a/src/i18n/messages/en/common.json b/src/i18n/messages/en/common.json
index 3ba0969..4ce593e 100644
--- a/src/i18n/messages/en/common.json
+++ b/src/i18n/messages/en/common.json
@@ -263,6 +263,7 @@
       },
       "showMore": "Show more",
       "showLess": "Show less",
+      "missing": "{{count}} missing",
       "toggleSidebar": "Toggle sidebar",
       "toggleTheme": "Toggle theme"
     }
diff --git a/src/i18n/messages/fr/common.json b/src/i18n/messages/fr/common.json
index 9d531c1..d5d75d3 100644
--- a/src/i18n/messages/fr/common.json
+++ b/src/i18n/messages/fr/common.json
@@ -262,7 +262,8 @@
         "remove": "Retiré des favoris"
       },
       "showMore": "Voir plus",
-      "showLess": "Voir moins"
+      "showLess": "Voir moins",
+      "missing": "{{count}} manquant(s)"
     }
   },
   "books": {
diff --git a/src/lib/providers/stripstream/stripstream.adapter.ts b/src/lib/providers/stripstream/stripstream.adapter.ts
index 679c2a1..5ba798f 100644
--- a/src/lib/providers/stripstream/stripstream.adapter.ts
+++ b/src/lib/providers/stripstream/stripstream.adapter.ts
@@ -79,6 +79,7 @@ export class StripstreamAdapter {
       genres: [],
       tags: [],
       createdAt: null,
+      missingCount: series.missing_count ?? null,
     };
   }
 
diff --git a/src/lib/providers/types.ts b/src/lib/providers/types.ts
index d581315..57f9ee8 100644
--- a/src/lib/providers/types.ts
+++ b/src/lib/providers/types.ts
@@ -25,6 +25,7 @@ export interface NormalizedSeries {
   genres?: string[];
   tags?: string[];
   createdAt?: string | null;
+  missingCount?: number | null;
 }
 
 export interface NormalizedBook {
diff --git a/src/types/stripstream.ts b/src/types/stripstream.ts
index 03437c5..d116728 100644
--- a/src/types/stripstream.ts
+++ b/src/types/stripstream.ts
@@ -49,6 +49,7 @@ export interface StripstreamSeriesItem {
   books_read_count: number;
   first_book_id: string;
   library_id: string;
+  missing_count?: number | null;
 }
 
 export interface StripstreamSeriesPage {