Ken Barnett

Addison returns to Seattle Grace to perform an operation and is surprised by all the changes in the lives of her former co-workers; Derek and Meredith's clinical trial has its first patient; Rebecca returns with shocking news for Alex.

Barney tries to track down a mystery woman who is warning other women not to sleep with him. He narrows the list down to 64 candidates.

Ari scrambles to keep the approval for Billy's script; Eric manages new client Anna Faris, but must also deal with her boyfriend.

While under FBI surveillance, Mary must lose her tail and find her father to clear her name before any other unfortunate events.

Mary is forced to protect her least favourite witness from hired mercenaries, on the day of her sister's wedding.

When he inherits his uncle's farm, Disher retires to live the agricultural life, but soon calls for Monk when he suspects that his uncle may not have died of natural causes.