Monica comes back when Frank needs her to sign documents and decides to take Liam with her. Meanwhile, Steve and Fiona move together.

The children's paternity is put into question and Frank needs Carl's help.

With Grammy near death, Frank exits the house but walks in on Ian and Mickey locked in passion at the Kash and Grab; when Lip drops out of school, Fiona proposes a deal where they both earn their diplomas, but Lip acts out and gets himself expelled when he realizes that Karen plans to sell their baby to the highest bidder.

Monica returns to party and plot scams with Frank, but the rest of the family suspects she hasn't returned to stay; Fiona reconsiders her decision to kick Lip out of the house; Grammy's death affects everyone differently, and leaves Frank determined to make sure he gets every last penny his mother left behind; Sheila and Jody think Eddie's ghost is haunting the house.

Fiona starts to plan for her future now that Monica is back but her reprieve may be short-lived as Monica falls apart, spends the squirrel fund and gets arrested; Steve conspires to reunite Estefania with her true love so that he can be with Fiona; Lip and Ian learn the true identity of Mandy's baby; Sheila takes in a homeless crack addict.

It's a typical Gallagher nontraditional Thanksgiving that includes a suicide attempt by Monica, Carl shooting a bald eagle, and Karen going into labor; Steve agrees to allow Estefania's boyfriend to steal his identity; Ian sleeps with a businessman named Ned; Frank tries to get his share of his mother's money from his brother Clayton.

A lonely Frank schemes to break Monica out of the psychiatric facility. Jimmy earns his way back into Fiona's good graces and she asks to meet his family while Ian runs into Ned again.

Frank grows concerned as Bianca's behavior becomes erratic and dangerous.

Fiona reunites with Gus. Frank works to keep Bianca happy. Season finale.

Monica is back! And her first task is to help Debbie get back Franny. Meanwhile, Frank tries to avoid her, Ian has his first fight with Trevor, Lip tries to mask his relapsing alcoholism and Fiona's laundromat gets a bad review.

Fiona, facing mounting issues, contemplates Margo's offer to buy the laundromat. Meanwhile, Ian tries to deal with the fact that Mickey might be out of prison and Kev and V take matters into their own hands after Svetlana's betrayal.

Frank and Monica have an interesting proposal for the kids. Lip buckles under pressure from Debbie to get his sobriety under control. Meanwhile, Fiona sees a business opportunity as Kev and V attempt to start a new chapter.

The Gallaghers grapple with the loss of one of their own. As Lip takes steps to improve his future, Debbie, Carl and Liam get roped into Frank's new scheme.