The Gallaghers are pleased when Carl starts bringing money into the household, but Lip is horrified to discover his brother's mini-enterprise is dealing drugs for the Maguires, and when someone informs the police and Mandy finds herself behind bars, Mimi and her son Shane Maguire (Nicky Evans) launch a manhunt for Carl. It falls on Lip and Ian to uncover the real traitor, save their brother from a savage beating, and save Mandy from a prison stretch. Will Lip and Mandy finally confront their feelings for each other before it's too late? Meanwhile, Sheila becomes convinced Karen is a lesbian and invites her and Jez (Lindsey Dawson) to dinner, so Frank decides to play Karen at her own games.