Insanity Defense

Aidan Collins has his very first large case when his client, Marina Vasiliev, a drop-dead gorgeous mental patient, is accused of killing her wealthy husband. Marina insists that she didn't do it, but Aidan can't trust her.
After all, he met Marina in the mental hospital–he originally obtained her as a client when she was involuntarily committed, and he assisted her with getting out.
Diagnosed with borderline personality disorder, Marina's view of reality shifts from day to day.
Marina has no memory of what happened the night that her husband died.
He makes the decision that the best way to defend her would be to try for the insanity defense. His client is not on board with this decision, and, to make things worse, she begins to imagine him as her lover, which turns his professional relationship with her upside down.
However, once Aidan gets more into the case, he begins to doubt that his decision to try for the insanity defense was a sound one. Before long, Aidan feels that his reality is shifting as much as his client.
Aidan can never be sure that he's doing the right thing in using the insanity defense. An eleventh hour witness throws his entire trial strategy into disarray.