Thomas Schall

When a debt collector is murdered, Holmes and Watson attempt to narrow down a suspect pool of thousands of consumers who owed the man money. Meanwhile, Watson's relationship with Andrew progresses when he asks her to meet his father for the first time.

When a knife-wielding attacker dressed as Baron Samedi, the Spirit of Death, stabs a man in costume on Halloween, Danny enters the world of voodoo. Meanwhile, DCPI Garrett opens up to Frank about a dark secret, and Erin and Nicky take Jack and Sean trick-or-treating.

Megan and the team investigate when a Philadelphia homicide detective is killed in a hit-and-run; Megan turns to her mother (Joanna Cassidy) for help.

Frank Elliot is a hotshot television reporter who has just returned from an embedded stint in Iraq. He is shot outside the hip bar Lotus, but survives. Briscoe and Green are investigating and it's clear Briscoe isn't fond of the reporter. At first the Detectives think a defense attorney, Barry Boyd, could be the suspect because Elliot exposed him. But he has an alibi, and besides, he says the publicity, even bad, has really helped his business. Boyd also informs them he's representing the families of three soldiers from the 81st battalion who were killed. The families are suing Elliot and his employer because he divulged the battalion's whereabouts on television, making them sitting ducks for the enemy, thus causing the deaths.

In tracking down the origin of a deadly strain of tuberculosis threatening Americans, Agent Ryan Booth must go undercover and infiltrate a white supremacist organization.