In honor of his birthday, San Francisco banker Nicholas Van Orton, a financial genius and a cold-hearted loner, receives an unusual present from his younger brother, Conrad: a gift certificate to play a unique kind of game. In nary a nanosecond, Nicholas finds himself consumed by a dangerous set of ever-changing rules, unable to distinguish where the charade ends and reality begins.
Loving but irresponsible dad Daniel Hillard, estranged from his exasperated spouse, is crushed by a court order allowing only weekly visits with his kids. When Daniel learns his ex needs a housekeeper, he gets the job -- disguised as an English nanny. Soon he becomes not only his children's best pal but the kind of parent he should have been from the start.