Boy meets girl; boy falls in love (and had wild, non-stop sex) with girl; boy loses girl... when they discover they are brother and sister! But when he learns that he's the victim of the ultimate case of mistaken identity, the lovesick young man -- whom everyone still thinks is after some taboo thrills -- must race across the country to stop her from marrying another man.

San Francisco comes alive in this amusing chronicle of urban life. When Tyler has a drunken one night stand with a local stripper, his secret precedes him all over town. Now amidst a haze of springtime revelry, he must make amends to his fiance before she dumps him for good.