Stephanie Fantauzzi

A hiker leads intelligence to a young woman being held captive in the woods near Chicago. A former relationship of Halstead's comes back into the picture, much to the surprise of Lindsay.

A petty officer's murder results in a lead in a 40-year-old airport bombing case; McGee is upset that he was not briefed on the cold case.

Kensi and Deeks go under cover at a rehab center named Tranquility Villa to investigate a Navy officer's death.

Monica's back – cooking, partying, and scamming with Frank just like old times. But the kids have to wonder: is she really here to stay? And while everyone is dealing with Grammy's death differently, Frank is eager to pick up Grammy's remains... her remaining cash from Dr. Pitts that he believes is hidden at Sheila's. However, Frank can't seem to find the time to claim his mother's ashes from the city morgue. Fiona begins to regret her decision to kick Lip out – especially when Karen wants to charge him rent. Lip searches for a new place to crash, and Steve agrees to take Lip in – an arrangement Fiona's not happy about it. Looking into starting her own hospice, Sheila and Jody suspect that Eddie's ghost is haunting the house. Terry Milkovich (guest star DENNIS COCKRUM) accuses Ian of getting Mandy (guest star EMMA GREENWELL) pregnant.

As summer comes to an end, Fiona is readying the kids for their return to school. When Jasmine invites Fiona on David's boat for one last summer blowout, she fails to mention that she also invited Steve and Estefania. To get back in Karen's good graces, Lip helps her forge a pre-nuptial agreement for Jody to sign. But Karen eventually snaps and kicks Jody out. Ian, meanwhile, continues to give Lip the silent treatment, and they soon come to blows. Meanwhile, Frank is officially Grammy's errand boy. And although he'd do just about anything to kick her out, Fiona likes having her around. That is, until Carl blows up their meth lab in the basement! Next door, Kev and V get a pet to help them get over the loss of Ethel.

While Sheila and Jody tend to a dying Grammy, Frank decides to remove himself from the house. He stops at the "Kash and Grab" and accidentally walks in on Ian and Mickey going at it. A panicked Mickey vows to kill Frank to keep him quiet. When Lip quits school, Fiona makes a bargain with him: she'll go back and get her diploma if he does. While she starts studying for the GED, Karen and Lip meet with adoption agencies. It soon becomes apparent to Lip, however, that Karen plans to sell their baby to the highest bidder. In response, he starts acting out and…gets expelled. Meanwhile, Steve steps up to coach Carl's football team.