Mitch and Cam's friend Sal is back with a bombshell, and Phil steps in to help Luke woo a girl he likes.
A murder investigation becomes personal for Lisbon when she learns that her underachieving younger brother, Jimmy, is being sought as a key witness.
The gang celebrates Halloween with a fancy dress party at Stuart's comic-book shop, but Sheldon and Amy can't agree about which costumes to wear.
Booth risks falling back into old ways when the death of a gambler drags him back into the world of poker; Hodgins reveals a new invention.
Danni breaks up with JD after realising that she'll always be in second place to Elliot. Meanwhile, Dr Cox grows a new-found sensitivity.
