- Castle senses a diary of a P.I from the 1940s found in the effects of a murdered modern-day treasure hunter is the key to finding the Blue Butterfly, a blue-diamond necklace. The team works out the story situated in 1947 in the same, now derelict, music club, involving murder, gangsters, and theft; they work out the true parts and identities of culprits and victims.—KGF Vissers
- A treasure hunter is murdered while investigating a long-abandoned nightclub in New York City. He was one of the many people searching for the Blue Butterfly, a valuable necklace which mysteriously disappeared in 1947. The treasure hunter had recently acquired the diary of Joe Flynn, a private detective who was supposedly murdered outside the nightclub in 1947. Castle uses the diary to retrace the last days in the life of Flynn, to attempt to solve a double homicide from 1947, and to locate the missing necklace. Meanwhile, he and Beckett investigate the current murder case, and interview the various people who had recent contact with the victim.—Dimos I
- 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.—ABC Publicity
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