In a gut-wrenching love triangle, a high school senior struggles with her own definition of loyalty in this YA contemporary romance about unconditional friendship, the limits of forgiveness, and the price of betrayal.

The first rule of friendship is simple: hands off your best friend's crush.

Friendship first, no exceptions.
So seventeen-year-old Cass is understandably wrecked when her best friend Alex latches onto Graham, the guy Cass has loved since forever. But Alex is so loaded with tears and apologies that it's impossible not to forgive her.

Friendship first, even when it hurts.
Before long, Graham blindsides Alex with a breakup no one saw coming. Alex has never needed Cass more. With her best friend desperate to find the reason beneath Graham's change of heart, Cass vows to be the perfect support system—spying, sneaking, scheming to help Alex lure Graham back. Until an impulsive kiss throws Cass into an unforgivable role in a love triangle with the guy she's always wanted, the same guy who's now off-limits by her own rules. This time forgiveness doesn't come easily, especially not for herself.