It means 'Shadowhunters: Looking Better in Black Than the Widows of our Enemies Since 1234'.
Cassandra ClareHis steady gaze held hers. His blue eyes were very dark, uniquely so. She had known people before with blue eyes, but they had always been light blue. Will's were the color of the sky just on the edge of night.
Cassandra ClareTo marry a girl just to make her a widow,โ said Gabriel Lightwood. โMany would say that was not a kindness.
Cassandra Clare