Jason Pendergraft

In this mid-season finale, Peter and Neal attend an FBI conference where someone is trying to steal high valued defense technology. They soon discover the thief's brazen plan to take something much more valuable from the FBI.

A killer leaves an envelope of cash on his victims; Holmes makes a gesture toward Watson as she deals with a personal crisis.

Mac investigates the murder of a bridegroom, whose body was wrapped like a wedding present; Stella finds a box of bloodstained puzzle pieces on her car; Mac goes home to Chicago to solve the biggest mystery of his life.

Claudia Joy experiences complications related to her diabetes; Frank is involved with a political upheaval in Africa; the gang gathers to celebrate Finn's birthday.

Tanya and Dr. Hanson try to save a wounded sergeant; Denise and Jackie visit the sergeant's family; Roxy gives encouragement to a withdrawn wife; Roland learns that Charlie is in a relationship.

Roland and Joan discuss legal issues; Denise offers CJ her kidney; Hector wants Gloria to quit working; Roxy has good news.