During the 2nd season finale, Mary decides to wear a wire in order to help Ben take down Olivia, but when their plan takes an unexpected turn, Mary must reconsider her allegiance; and as Des and Nicole prepare for Brendan's death, Des faces crippling self-doubt about his dream and his partner
All seems well for Mary Harris since Ben has forgiven her, and she and Des have decided tomove forward with the death retreat. However, Mary is concerned about her weakened relationship with her daughter Jess, so she decides to make amends by taking her on a special night out together.
Following the disappearance of Travis, Des worries that he and Mary may have crossed a moral line from which they can never return. After jeopardizing Ben's investigation of Olivia, Mary tries to make amends, which has repercussions for a patient.
Des is happy to reteam with Mary following his stint in prison. However, when a routine case leads to a devastating outcome, Mary questions whether she was better off fighting the good fight without him.