Michael Patrick Thornton

Holmes' former protégé, Kitty Winter, warns him of a killer who is eliminating everyone involved with a case they worked on together in London. Watson discovers that Kitty has a life changing secret.

The doctors venture into controversial territory when an unexpected new hire at Pacific Wellcare causes Naomi to struggle with the idea of genetically designing babies. Meanwhile, Violet decides to try electric shock therapy on a patient.

Addison is shaken by the arrival of her father to Los Angeles and Cooper is arrested when he refuses to cooperate in a case involving a longtime patient.

Maya's announcement shocks Sam and Naomi; Pete challenges Fife on a patient with a cutting-edge bionic arm.

Sam convinces Violet to help plan Maya's wedding when Naomi refuses to take part, tensions between Addison and Sam rise.

Addison clashes with Sam's new girlfriend, Vanessa, over treatment for a patient whose life, and those of her unborn triplets, hangs in the balance.