diff --git a/cli/worblehat.py b/cli/worblehat.py
index e3d3f42..fd45de0 100644
--- a/cli/worblehat.py
+++ b/cli/worblehat.py
@@ -43,6 +43,10 @@ q_books_for_person = \
     'FROM bookperson ' \
     'INNER JOIN book ON bookperson.book=book.isbn ' \
     'WHERE bookperson.person=%(id)s'
+q_books_for_category = \
+    'SELECT isbn, title ' \
+    'FROM book ' \
+    'WHERE category=%(id)s'
 
 def connect_to_db():
     connection = pgdb.connect(database='oysteini_pbb2',
@@ -85,6 +89,11 @@ def get_books_for_person(connection, person_id):
     c.execute(q_books_for_person, {'id': person_id})
     return fetchall_dict(c)
 
+def get_books_for_category(connection, cat_id):
+    c = connection.cursor()
+    c.execute(q_books_for_category, {'id': cat_id})
+    return fetchall_dict(c)
+
 def show_book(book):
     s = ''
     if book['id']:
@@ -128,8 +137,15 @@ def show_person(person):
         s += ' (no books by this person)\n'
     return s
 
-def show_category(category):
-    return ''
+def show_category(cat):
+    s = 'category %s\n' % cat['id']
+    s += 'Name: %s\n' % cat['name']
+    s += 'Books:\n'
+    for book in cat['books']:
+        s += ' %-13s %s\n' % (book['isbn'], book['title'])
+    if len(cat['books']) == 0:
+        s += ' (no books)\n'
+    return s
 
 def show(connection, ids, commit_format=False, tmp_file=False):
     objects = map(lambda id: get_by_id(connection, id), ids)
@@ -139,9 +155,12 @@ def show(connection, ids, commit_format=False, tmp_file=False):
             persons = get_persons_for_book(connection, objects[i]['isbn'])
             objects[i]['persons'] = list_of_dicts_to_dict(persons, 'relation', 'id')
             objects[i]['persons_data'] = persons
-        if typ == 'person':
+        elif typ == 'person':
             books = get_books_for_person(connection, objects[i]['id'])
             objects[i]['books'] = books
+        elif typ == 'category':
+            books = get_books_for_category(connection, objects[i]['id'])
+            objects[i]['books'] = books
         if not objects[i]:
             objects[i] = 'No object with id %s.\n' % ids[i]
         elif commit_format: