Plot summary
Pete comes back to the practice even with all of the doctors suggesting that he takes another week off. Sam, Addison, and Sheldon begin interviewing potential replacements for Naomi, including Jake Reilly, which freaks Addison out. Sheldon tries to convince Charlotte to let Amelia back at the hospital by making her take a breathalyzer test. Cooper illegally and secretly uses another family's cord blood to help a patient with leukemia, leaving Charlotte to clean up the legal mess. Addison finds that Sam and Jake know each other, while Pete begins taking his post-heart attack anger out on Violet who is acting as his therapist, nurse, and wife all the same time.
Charlotte agrees to restore Amelia's hospital privileges if she'll take a breathalyzer test, while Addison decides to hire Jake. Violet tells Pete that he needs to get a therapist. Cooper is vindicated for his decision to break the law to save a patient's life. Amelia begins drinking again.
Credits
Adapted from Wikipedia contributors, Private Practice season 5. HTML formatting and reference markers removed.