diff --git a/oml/db.py b/oml/db.py
index 01f2574..c2b19ad 100644
--- a/oml/db.py
+++ b/oml/db.py
@@ -116,7 +116,7 @@ def drop_columns(table, columns):
     }
     create_table = get_create_table(table)
     for column in columns:
-        create_table = re.sub('(%s .*?,)'%column, '', create_table)
+        create_table = re.sub('(%s .*?,)' % column, '', create_table)
     create_table = create_table.replace('\n', '').replace(',', ',\n')
     create_table = re.sub('\n *', '\n    ', create_table).replace('(    ', '(\n    ')
     sql = [
diff --git a/oml/item/api.py b/oml/item/api.py
index 6bd441c..0fd7a6a 100644
--- a/oml/item/api.py
+++ b/oml/item/api.py
@@ -9,7 +9,7 @@ from sqlalchemy.sql.expression import text
 from sqlalchemy import func
 
 from oxtornado import actions
-import utils #utils must be imported before websocket to avoid loop
+import utils  # utils must be imported before websocket to avoid loop
 from websocket import trigger_event
 import meta
 from . import models
diff --git a/oml/item/scan.py b/oml/item/scan.py
index 632da9c..950c2fd 100644
--- a/oml/item/scan.py
+++ b/oml/item/scan.py
@@ -132,21 +132,57 @@ def run_scan():
     prefix = get_prefix()
     books = collect_books(prefix)
     remove_missing(books)
+    ids = set()
 
     added = 0
+
     with db.session():
+        user = state.user()
         for f in ox.sorted_strings(books):
             if state.shutdown:
                 break
             if os.path.exists(f):
                 id = media.get_id(f)
                 file = File.get(id)
+                if id in ids:
+                    logger.debug('file exists in multiple locations %s', id)
+                    if file:
+                        f1 = file.fullpath()
+                        f2 = os.path.join(prefix, f)
+                        if f1 != f2 and os.path.exists(f1) and os.path.exists(f2):
+                            logger.debug('"%s" vs "%s"', f1, f2)
+                else:
+                    ids.add(id)
+
                 if not file:
                     file = add_file(id, f, prefix, f)
                     added += 1
+                elif user not in file.item.users:
+                    item = file.item
+                    item.add_user(user)
+                    logger.debug('add %s to local user', id)
+                    add_record('additem', item.id, file.info)
+                    add_record('edititem', item.id, item.meta)
+                    item.update()
+                    added += 1
+        library_items = len(user.library.items)
     if added:
         trigger_event('change', {})
         logger.debug('imported %s unknown books', added)
+    if len(ids) != len(books):
+        logger.debug('number of books %s vs number of ids %s', len(books), len(ids))
+    if library_items != len(books):
+        logger.debug('number of books %s vs number of items in library %s', len(books), library_items)
+        library_items = set([str(i) for i in user.library.items])
+        gone = library_items - ids
+        if gone:
+            logger.debug('cleaning up %s deleted records', len(gone))
+            for id in gone:
+                i = Item.get(id)
+                i.remove_file()
+        missing = ids - library_items
+        if missing:
+            logger.debug('%s items in library without a record', len(missing))
 
 def change_path(old, new):
     new_books = os.path.join(new, 'Books')
diff --git a/oml/library.py b/oml/library.py
index 5590944..d61398f 100644
--- a/oml/library.py
+++ b/oml/library.py
@@ -93,7 +93,7 @@ class Peer(object):
         elif action == 'edititem':
             itemid, meta = args
             item = self.library.get(itemid, {})
-            if not 'meta' in item:
+            if 'meta' not in item:
                 item['meta'] = meta
             else:
                 item['meta'].update(meta)
@@ -111,7 +111,7 @@ class Peer(object):
             name = args[0]
             if len(args) > 1:
                 query = args[1]
-            if not name in self.info['lists']:
+            if name not in self.info['lists']:
                 self.info['lists'][name] = []
         elif action == 'editlist':
             name, new = args
@@ -127,7 +127,7 @@ class Peer(object):
                 del self.info['lists'][name]
         elif action == 'addlistitems':
             name, ids = args
-            if not name in self.info['lists']:
+            if name not in self.info['lists']:
                 self.info['lists'][name] = []
             self.info['lists'][name] = list(set(self.info['lists'][name]) | set(ids))
         elif action == 'removelistitems':
@@ -141,14 +141,14 @@ class Peer(object):
             # fixme, just trigger peer update here
             from user.models import User
             peer = User.get_or_create(peerid)
-            if not 'username' in peer.info:
+            if 'username' not in peer.info:
                 peer.info['username'] = username
                 peer.update_name()
                 peer.save()
         elif action == 'editpeer':
             peerid, data = args
             if len(peerid) == 16:
-                if not peerid in self.info['peers']:
+                if peerid not in self.info['peers']:
                     self.info['peers'][peerid] = {}
                 for key in ('username', 'contact'):
                     if key in data:
diff --git a/oml/nodes.py b/oml/nodes.py
index ab6fc46..d16b402 100644
--- a/oml/nodes.py
+++ b/oml/nodes.py
@@ -567,7 +567,7 @@ class Nodes(Thread):
             node.join()
         if self.local:
             self.local.close()
-        return Thread.join(self)
+        return super().join(1)
 
 def publish_node():
     update_online()
diff --git a/oml/pdict.py b/oml/pdict.py
index bd20b3e..a648d24 100644
--- a/oml/pdict.py
+++ b/oml/pdict.py
@@ -21,7 +21,7 @@ class pdict(dict):
                 json.dump(self, fd, indent=4, sort_keys=True, ensure_ascii=False)
 
     def get(self, key, default=None):
-        if default == None and self._defaults:
+        if default is None and self._defaults:
             default = self._defaults.get(key)
         return dict.get(self, key, default)