The Enemy Within (Part 6) (S05E06)

Alisha manages to secure incriminating evidence against Drummond from his wife, Chrissy. However, after an assault leads to the evidence being stolen, its retrieval reveals that Drummond's son, Luke, was behind the attack. Fearing that his secrets are about to be exposed, Drummond visits Joseph, pleading with him to keep quiet. The link between Joseph, Mo Jones, and Drummond will ultimately unravel the truth behind Sarah's murder, along with that of Martha and her husband, leading to Drummond's downfall.