diff --git a/src/calibre/customize/builtins.py b/src/calibre/customize/builtins.py
index 8301136961..93344f4616 100644
--- a/src/calibre/customize/builtins.py
+++ b/src/calibre/customize/builtins.py
@@ -457,11 +457,12 @@ from calibre.devices.misc import PALMPRE, AVANT
 from calibre.devices.folder_device.driver import FOLDER_DEVICE_FOR_CONFIG
 from calibre.devices.kobo.driver import KOBO
 
-from calibre.ebooks.metadata.fetch import GoogleBooks, ISBNDB, Amazon
+from calibre.ebooks.metadata.fetch import GoogleBooks, ISBNDB, Amazon, \
+    LibraryThing
 from calibre.ebooks.metadata.douban import DoubanBooks
 from calibre.library.catalog import CSV_XML, EPUB_MOBI
 plugins = [HTML2ZIP, PML2PMLZ, ArchiveExtract, GoogleBooks, ISBNDB, Amazon,
-        DoubanBooks, CSV_XML, EPUB_MOBI]
+        LibraryThing, DoubanBooks, CSV_XML, EPUB_MOBI]
 plugins += [
     ComicInput,
     EPUBInput,
diff --git a/src/calibre/customize/ui.py b/src/calibre/customize/ui.py
index 9b3e190e85..8397827fbb 100644
--- a/src/calibre/customize/ui.py
+++ b/src/calibre/customize/ui.py
@@ -183,10 +183,7 @@ run_plugins_on_postprocess = functools.partial(_run_filetype_plugins,
                                                occasion='postprocess')
 # }}}
 
-
-
-
-# PLugin customization {{{
+# Plugin customization {{{
 def customize_plugin(plugin, custom):
     d = config['plugin_customization']
     d[plugin.name] = custom.strip()
diff --git a/src/calibre/ebooks/metadata/fetch.py b/src/calibre/ebooks/metadata/fetch.py
index a7fd76c661..d12c668e0d 100644
--- a/src/calibre/ebooks/metadata/fetch.py
+++ b/src/calibre/ebooks/metadata/fetch.py
@@ -198,6 +198,38 @@ class Amazon(MetadataSource):
             self.exception = e
             self.tb = traceback.format_exc()
 
+class LibraryThing(MetadataSource):
+
+    name = 'LibraryThing'
+    metadata_type = 'social'
+    description = _('Downloads series information from librarything.com')
+
+    def fetch(self):
+        if not self.isbn:
+            return
+        from calibre import browser
+        from calibre.ebooks.metadata import MetaInformation
+        import json
+        br = browser()
+        try:
+            raw = br.open(
+                    'http://status.calibre-ebook.com/library_thing/metadata/'+self.isbn
+                    ).read()
+            data = json.loads(raw)
+            if not data:
+                return
+            if 'error' in data:
+                raise Exception(data['error'])
+            if 'series' in data and 'series_index' in data:
+                mi = MetaInformation(self.title, [])
+                mi.series = data['series']
+                mi.series_index = data['series_index']
+                self.results = mi
+        except Exception, e:
+            self.exception = e
+            self.tb = traceback.format_exc()
+
+
 def result_index(source, result):
     if not result.isbn:
         return -1
@@ -266,7 +298,7 @@ def get_social_metadata(mi, verbose=0):
     with MetadataSources(fetchers) as manager:
         manager(mi.title, mi.authors, mi.publisher, mi.isbn, verbose)
         manager.join()
-    ratings, tags, comments = [], set([]), set([])
+    ratings, tags, comments, series, series_index = [], set([]), set([]), None, None
     for fetcher in fetchers:
         if fetcher.results:
             dmi = fetcher.results
@@ -279,6 +311,10 @@ def get_social_metadata(mi, verbose=0):
                 mi.pubdate = dmi.pubdate
             if dmi.comments:
                 comments.add(dmi.comments)
+            if dmi.series is not None:
+                series = dmi.series
+                if dmi.series_index is not None:
+                    series_index = dmi.series_index
     if ratings:
         rating = sum(ratings)/float(len(ratings))
         if mi.rating is None or mi.rating < 0.1:
@@ -295,6 +331,9 @@ def get_social_metadata(mi, verbose=0):
             mi.comments = ''
             for x in comments:
                 mi.comments += x+'\n\n'
+    if series and series_index is not None:
+        mi.series = series
+        mi.series_index = series_index
 
     return [(x.name, x.exception, x.tb) for x in fetchers if x.exception is not
             None]
diff --git a/src/calibre/gui2/dialogs/config/social.py b/src/calibre/gui2/dialogs/config/social.py
index 6a767e7b3b..ad14ea05b0 100644
--- a/src/calibre/gui2/dialogs/config/social.py
+++ b/src/calibre/gui2/dialogs/config/social.py
@@ -49,6 +49,9 @@ class SocialMetadata(QDialog):
         self.mi.tags = self.worker.mi.tags
         self.mi.rating = self.worker.mi.rating
         self.mi.comments = self.worker.mi.comments
+        if self.worker.mi.series:
+            self.mi.series = self.worker.mi.series
+            self.mi.series_index = self.worker.mi.series_index
         QDialog.accept(self)
 
     @property
diff --git a/src/calibre/gui2/metadata.py b/src/calibre/gui2/metadata.py
index d63e9648cc..daed69725c 100644
--- a/src/calibre/gui2/metadata.py
+++ b/src/calibre/gui2/metadata.py
@@ -127,6 +127,10 @@ class DownloadMetadata(Thread):
                     self.db.set_tags(id, mi.tags)
                 if mi.comments:
                     self.db.set_comment(id, mi.comments)
+                if mi.series:
+                    self.db.set_series(id, mi.series)
+                    if mi.series_index is not None:
+                        self.db.set_series_index(id, mi.series_index)
 
         self.updated = set(self.fetched_metadata)