Stacy Warner returns to PPTH, having been officially hired as the hospital's General Counsel. House eventually realizes that he still has feelings for her. In an attempt to prove that she feels the same way about him, he breaks into her therapist's office and reads her file. House learns that she is not sleeping with her husband Mark Warner. He tries to get back with her by killing a rat that has invaded her home, but soon changes his mind after learning that the rat has an illness that brings out the diagnostician in him.