Christmas Eve in New York, and the lonely divorced publisher, Rose Collins, needs a miracle to improve the health of her mother, interned in a hospital with Alzheimers. She feels sorry for another patient and meets his visitor. Meanwhile, Nina Vasquez breaks her engagement with her beloved fiancé Mike due to his suffocating jealousy, but misses him. Mike is stalked by a stranger, bartender Artie Venzuela. The poor Jules arranges to spend Christmas Eve in the hospital, where he spent the best Christmas of his life when he was a teenager. The lives of some of these characters cross with others along the night.

Catherine meets Nick by accident and, after a whirlwind romance, the two get married and Catherine moves into Nick's apartment only that's the start of problems when an unseen intruder begins playing strange mind games with Catherine in an apparent attempt to drive her insane.