Castle senses a diary of a P.I from the 40's 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.
Did You Know?
Zahn McClarnon appears in this episode. See more
as "Dempsey's Cuban" says in Spanish "Vera! ¿Que pasando?". This line doesn't have any sense in Spanish, if it was translated in English he would said "What happening?". The correct line should be "¿Que esta pasando?" or "¿Que esta ocurriendo?". See more
Comes a rain storm, put your rubbers on your feet / Comes a snow storm, you can get a little heat / Come love, nothing can be done...
Due to the nature of the episode, the usual music in the title sequence has been replaced with a jazz theme. See more
Performed by Tamala Jones See more