The day of Frank's wedding to Sheila draws near, but he begins to get cold feet when she confesses to murdering an abusive previous husband, Sheldon. Kev and Veronica are forced to intervene when it looks like the wedding could be called off. Frank must decide whether he loves Sheila enough to deal with her dark secrets, and it's a race against time for him when Sheila decides to confess to the police. Meanwhile, Lip is determined not to end up like his father when he forgets to meet Mandy and Katie after a night out, forcing him to make a huge commitment to them both. Elsewhere, Debbie uses a schoolboy crush to her advantage.