Episode Description: Beware, spoilers! To read - hover over the text.
During the demolition of the building, built in 1978, one finds the remains of famous Mafiosi the days of "disco". The detectives of the 12th precinct and castle begin to ask questions all the enemies and friends of the victim and suddenly find someone who could tell them the killer's name. The only problem is that this witness lives in his own world, where everything is time 1978. To get him at least something, detectives, forensic scientists and ordinary police officers transform into their counterparts from the 70s and turn 12 plot in a small island of the era of "disco". Shortly before this March took up a flower arrangement for the wedding of Richard and Kate. Ethusiasm Martha have caused tension between her and Castle.