David Figlioli

To track down the infamous arms dealer Dan "Daniel" Valdano (guest star David Figlioli), Jake and Terry go undercover at an illegal gambling club, but when Holt gets involved to coach the two in the art of poker, his addiction resurfaces. Meanwhile, Boyle buys a food truck that was formerly used in a brutal string of murders without telling his investor, Amy, and Hitchcock and Scully challenge Rosa to a "Butt-lympics."

After two teens are found murdered, the investigation leads Don and his team to uncover a dangerous counterfeit money ring. Charlie is called in to use his mathematical expertise to pinpoint the location of the counterfeiters by analyzing the dispersion of the bogus money. In the process, he also discovers a surprising connection to the disappearance of a local artist. Meanwhile, Charlie realizes how little he knows about his brother when he meets someone from Don’s romantic past.

When a casino owner is murdered at an abandoned warehouse, suspects emerge in New York and Atlantic City; during the investigation, Castle throws an impromptu bachelor party for Ryan.

Jane and the team investigate when an elderly heiress's remains are found in her spooky mansion.

When Christy’s car dies, Bonnie refuses to let Adam loan her money for a new one, on the 100th episode.