Mysteries At The Museum

Dial M for Missing, $7 Renoir, Secret in the Attic (7x13)

Air date: Dec 26, 2014

Don examines a timeworn tome that may explain the perplexing disappearance of the world's greatest mystery writer, a Renoir painting believed to have been bought for just $7, and a police ledger that tells the tale of a secretive love affair that ended in murder.