Linden McGregor is tall, rugged, and gunslinger handsome-a helicopter pilot with a Scottish brogue and charm to spare. He's also one of Stephanie Robson's best friends and has fit into that box for as long as she's known him.

Beautiful, funny, and an ambitious businesswoman, Stephanie Robson is one of Linden McGregor's best friends and has fit into that box for as long as he' known her. But some relationships can't be boxed, can't be classified, can't be tamed.

Back in their mid-twenties and tired of the competitive hit-or-miss dating scene of San Francisco, Steph and Linden made a pact to marry each other if neither one of them are in a serious relationship by the time they hit thirty.

It sounded like fun and games at the time but as the years to thirty tick past and lovers come and go out of their lives, the pact becomes larger than life.

Sex is inevitable. Friendships are tested. Hearts are on the line. The pact is about to change everything.