Mac Brandt

The agents get up close and personal with a biker gang after their lawyer is found dead. The evidence points to a carjacking gone wrong, but the agents soon unearth a number of suspects closer to home.

Kidd and Severide's honeymoon is interrupted by a dangerous person from their past; Kidd's former academy classmate joins Firehouse 51; Brett and Violet reflect on their relationships.

The big wedding day arrives and Firehouse 51 welcomes Casey back to celebrate the joyous occasion; Emma's plans to replace Violet come to a shocking end.

A man claims his friend was consumed by a tree-like figure; the gang takes extra precautions after learning of Eve's disturbing mirror encounter; Capt. Renard tries to find answers about what Diana was drawing.

The Feds call in Bell and Stabler when they suspect a gruesome murder could be connected to a string of bank robberies; when a DNA match is tied to a suspect with the perfect alibi, the team struggles to make a case against him.

Stateside strife taints Holmes and Watson's fresh start in London when someone close to them is wounded by an unknown perpetrator in the US. Meanwhile, Holmes' stateside legal trouble threatens to derail their efforts.