Jack Mason—graphic designer and unrepentant player—has never been interested in monogamy. He certainly isn’t looking for romance when he meets Professor Colin Sloan.

Newly single and not looking for anything serious, Colin is intrigued by Jack’s offer of a physical affair with no strings attached. Becoming friends wasn’t part of the plan, but as accidents go, this one’s pretty great.

Peter Mason is Jack’s identical twin. In a long-term relationship himself, Peter tells no one that he’s falling for his brother’s newest favorite, even as the secret creates tension with his girlfriend.

When Peter’s relationship falls apart, he seduces Colin, fully expecting Jack to forgive his transgression. But Jack is keeping secrets too—he hasn't told even Colin that he’s fallen in love. Suddenly the twins are feuding, and Colin is caught in the middle, blindsided by the revelation that he doesn’t want to choose between them.

Now all three must find a way to share, or they’ll tear each other apart.