John Ruby

When a bomb kills five people at a protest rally, Beckett and Castle try to solve the case by reconstructing the 47 seconds prior to the explosion.

Raylan turns to an old friend for help after Ava makes a drastic decision.

Ken is asked to speak at a banquet honoring Kevin O'Connell -- Allison's attractive and successful ex-boyfriend; a school assignment requires Molly to figure out what she wants to be when she grows up.

A massage mishap breaks the ice with a sexy, eligible client, leaving Riley (Jennifer Love Hewitt) to wonder if she's ready to start dating. Meanwhile, Linette's (Cybill Shepherd) relationship with Garrett (Brian Kerwin) seems headed for the long haul until damaging secrets from Garrett's past force Riley to intervene.

When a woman is found dead in Mexico and a murdered couple is discovered in a driveway, evidence from one investigation could help the other.

The investigation of a lab tech's murder reveals strange similarities to a cold case from the 1950s; the team catches a glimpse of what goes on in the lab.