Grace is on a special FBI taskforce investigating a prostitution ring. Her home life is complicated by her mother, Vivian, who shows up after a prolonged absence. Tom has something to tell Grace. Ethan and team negotiate their first contract.

Grace confronts Elliot and Leni about her concerns for finding Sarah. Evidence is uncovered. Detective Lee becomes a liason. Elliot reveals to Leni the true nature of their investigation. Ethan, Ray and Spud find out about Cheat and take action.

Grace discovers Ethan hasn't been truthful about the night Cheat died. Leni reaches out to a Pentagon contact and discovers how Ethan and his team met. Detective Lee tails Ethan. Ethan and the team feel they're in danger. Billy and Evie grow closer.

Grace thinks about going undercover whilst Elliot tells Leni aoff about her contact in the Pentagon. Spud and Ray find an unlikely new ally.

Grace is shocked when someone from her past, re-emerges. Leni's contact provides her with more information. Grace finds out about Billy's scrap. The force decide to plant a bug in order to spy on Ethan's team.

Spud looks for help from Ethan and Ray, and comes up with a plan to leave town. Grace shares her findings about Ethan with Leni and Elliot.

Ethan reveals to Grace they borrowed money from the wrong men. Ray realizes something is wrong with Spud. Ethan, suspicious, digs into Grace's background. Grace tries to help Billy but it backfires. Spud and Ray have a heart-to-heart talk.

A surprise discovery is made by Leni and Grace in Vancouver. The truth about Cheat's death is also revealed.

Ethan and Ray fall out. Grace says sorry to Evie. Leni and Grace find out the original source of Ethan's money. Sarah and Grace work together to track Ethan and Ray.