The Plot Thickens (1936) is a Mystery, Comedy film that follows a priceless Cellini silver cup is stolen from a local museum with both Hildegarde and Oscar on the case. The Plot Thickens is not currently listed with streaming providers in your selected region, but availability can change over time. It has a user rating of 6.3 out of 10 from 10 votes. Fans of mystery movies may also want to explore similar titles below.