When it comes to your ex, nothing is ever easy.

The Borealis boys are settling into their new normal, or at least into their new digs. But when North's soon-to-be (please-let-it-be-soon) ex-husband, Tucker, is arrested and charged with murder, everything goes sideways.

Hired by Tucker's parents, North and Shaw begin looking for proof that Tucker is innocent, in spite of the evidence against him. When they find seemingly incriminating photos hidden in Tucker's BMW, North is convinced that someone is trying to frame Tucker-and might get away with it.

But the cast of alternate suspects presents its own challenges: an estranged son, a betrayed wife, and North and Shaw's close-knit circle of friends from college-men who had their own connections to the victim, and who had their own reasons for wanting him dead. A threatening email suggests that the motive, whatever it might be, lies buried in the past, in a relationship gone wrong. The question is, which one?

When Tucker is poisoned, North and Shaw realize that the killer isn't finished. Clearing Tucker's name won't be enough; they must find the killer before someone else dies. And to do so, they will have to unearth truths from their own pasts.