Jason agrees to grant Ian his wish - a rendezvous with the object of his desire, Olivia. But it comes with a catch: Ian must pose as Jason at a black-tie event honoring Dr. Vanessa Young. Ian's antics threaten to ruin the night, pushing Lena into the arms of another man, and putting Young's daughter Abby in mortal danger. But Jason stays true to his word, and Olivia later greets Ian in a hotel room? with a dangerous ulterior motive.
Dr. Jason Cole is a highly respected neurosurgeon who has it all - a lucrative career, confident charm, the gift of compassion. But he also has a deep, dark secret. One morning when he wakes up disoriented in a wrecked hotel room amidst several near-naked women he's never seen before, he knows one thing: it's happening again.
Every night at the same hour, something inside Jason changes, leaving him almost unrecognizable - seductive, devious, borderline sociopathic. This new man is his dangerous alternate personality who goes by the name of �Ian Price'. For years he's battled Ian, keeping him in check with a powerful experimental sedative.
But now his - their - body has developed a resistance to the serum, setting Ian free once again. And to make matters worse, after being suppressed for so long, Ian's hell-bent on taking revenge on his oppressor. With everyone Jason cares about at risk - patients, friends, coworkers and even the woman he loves - he's got to stop Ian once and for all. Will they find some common ground, or will they bring each other down? Hell hath no fury like an alter ego scorned.