Castle
The Blue Butterfly still
S04E1444 min· aired 2/6/2012

The Blue Butterfly

TMDb8.0
Nexus es235349TMDb ep 64854TVDb ep 4205192

Overview

When Castle and Beckett investigate the killing of a treasure hunter, they discover the case is linked to a mysterious homicide from 1947 involving a hard-boiled private detective. Castle realizes the only way to solve the present-day murder is to solve the murder from the past. The 1947 case comes to life through stylized flashbacks, featuring Castle as the private eye and Beckett as a femme fatale.