Dizi Adı: Castle
Bölüm Adı: The Blue Butterfly
Sezon/Bölüm: 4. Sezon 14. Bölüm
Yayın Tarihi: 6 Şub. 2012

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.