Castle: The Blue Butterfly

SYNOPSIS

Beckett and Castle visit the Pennybaker, a former nightclub with a notorious history, and now the site of a fatal shooting. The victim is revealed to be an avid treasure-hunter obsessed with locating a jewel-encrusted necklace went missing in 1947, and when Castle finds the diary of a hard-boiled 1940s detective Joe Flynn on the man's body, he uses the entries within to imagine himself in the role of the private eye in an attempt to shed light on both the necklace's disappearance and the modern-day murder. Crime drama, starring Nathan Fillion and Stana Katic.