Aaron agrees to cooperate with the plan to act as bait and get a confession from the killer. However, the plan quickly goes off the rails, and Colleen scrambles to apprehend the culprit and Leland ends up in the crossfire. The full truth finally comes to light, and everyone in Exeter is left to grapple with the choices they’ve made. Coming home, Colleen and Leland try to mend their relationship and find some way back.
The body count rises as the detectives discover what happened to Arthur, and Colleen questions whether Lucy is telling the truth after the facts don’t add up. Meanwhile, Leland is devastated by the death of his friend, and vows to protect Lucy at all costs. Suspicious of Lucy, Colleen and Pruitt follow her and discover the real nature of Aaron & Lucy’s relationship, and use that information to pressure Aaron into coming clean about what happened to Robin and Billy.
Colleen feels responsible for Joan’s actions, and they finally have a break in the case when Pruitt finds a surprising connection between Lucy and Aaron, leading them to believe that Lucy knows much more than they thought. When the warrant for the Wade house comes through, Colleen is forced to go up against Leland again, and the detectives discover the murder weapon in an unexpected location. Arthur continues to mentally spiral, while Lucy tries everything to get through to him.
When Travis gets a tip on the murder weapon, Colleen and Pruitt are finally forced to do the one thing they have been trying to avoid, question Arthur about the night Robin died, to disastrous results when Leland ends up in the middle. Back home, Colleen feels the full weight of her actions as the conflict with Leland results in a devastating fight, leading Colleen to take shelter in the Pruitt home. Meanwhile, Joan enacts her plan to get justice for her son.
Following the dramatic events of the Waffle House shootout, Colleen and Pruitt learn key information about the murder weapon from Darryl Ballinger, who also reveals that Aaron knows a lot more about the case than he initially let on. Meanwhile, Colleen and Pruitt learn that Arthur has not been honest about Robin’s final night, which puts Colleen in a difficult situation with Leland. Joan, convinced that Aaron killed her son, makes a dangerous decision to take things into her own hands.