Elly, Mark, Aaron, and Susan investigate Finns past and discover that he was involved in a gas attack. They work together to protect Finn from the consequences of his actions and help him regain his memory.

Elly has a difficult conversation with Mark where she reveals her pregnancy and that she slept with Shaun, Finns brother. Mark is devastated and leaves, and Elly follows him, but he tells her to stay away. Meanwhile, Paul and Terese sense something suspicious is going on with Gary and Jimmy, and Kyle has a surprise for Amy.