Determined to ignore Andy's unexpected arrival the night before, Lisa throws herself into the case and discovers a significant lead from her only eyewitness.  The new information opens up the investigation and the team uncover vital evidence, forcing them to deal with a difficult suspect.  Meanwhile, Lisa questions Andy's motives as he remains determined to rebuild a relationship with his family, whilst Penny discovers she is being kept in the dark by Lisa and the kids.  

Following an unexpected turn in the case, Lisa and the team struggle to keep their heads in the game as they're forced to accept help from a new unit.