Recovering from the events of the previous episode, Helen reflects on her relationship with Elliot and finds herself drawn to the mysteries of the past. As Helen digs deeper into the history of the McDonnell and Cassidy feud, she and Elliot realise that the truth may destroy their relationship. Meanwhile, Elliot is forced to reckon with the consequences of his actions and must make a choice in order to protect the ones he loves. Niamh refuses to back down but runs the risk of hurting others in the process.