When a patient's father and partner can't agree on his health care, Pete makes a decision; Jake suspects Amelia is being tempted to substance abuse.
An illegal immigrant facing deportation tries to induce her pregnancy by herself so her child will be a U.S. citizen; Violet wants to keep going to therapy with Pete.
Pete and Violet go to a marriage counselor; Amelia gets some devistating news; Mason refuses to speak to Charlotte and Cooper.
Charlotte and Cooper try to help Mason come to terms with Erica's rapidly deteriorating condition; Pete and Violet discover they still have feelings for each other.
Sam struggles to take care of his sister; Sheldon finds out that Amelia has life-altering news; Addison and Jake continue to flirt.
Charlotte and Cooper bring Erica to Seattle Grace to speak with Amelia, Derek and Lexie about a risky surgery.
Sam finds his estranged sister in jail, heavily medicated and in a nearly catatonic state; Erica begins secret cancer treatments.
Cooper and Charlotte are forced to deal with their future when Erica and Mason get in an accident; Addison and Jake go to a medical conference.
Cooper, Charlotte and Amelia counsel Erica on a tough decision; Addison and Jake meet with potential surrogates.
Pete, Violet, Sam and Addison adjust to their new lives; Addison second-guesses her desire for a baby; Violet thinks about dating a paramedic.
Cooper must decide whether or not to punish Mason after he is caught stealing; Pete and Violet struggle to split time with Lucas; Addison prepares for a new baby.
Amelia bonds with an 18-year-old woman as they endure painful drug detox in rehab; a patient in need tests Cooper's bond with his son.
The doctors stage an intervention for Amelia after she returns from a 12-day drug binge with her boyfriend.
Amelia's drug addiction accelerates as she begins writing herself prescriptions and skipping work; Jake and Addison face an impossible choice; Violet returns to work.
Charlotte faces painful memories of a horrible tragedy; Amelia continues to spin out of control; Addison takes a step closer to motherhood.
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