Alistair never meant for anything bad to happen to Isla. He's spent his entire life wishing he could be more like her and hating the demon side of his heritage. Since realizing his immortality has settled, he's been scrambling to find a solution. He can't bear the thought of living a day without Isla by his side, let alone eternity. When his plans to make Isla immortal are thwarted, Alistair's only hope to rescue his best friend lies with his newly discovered fated mates-Lord Rian of the Unseelie Court and the eccentric and ancient witch Matthieu.

Meanwhile, Isla is doing her best to adjust to her new life in Briya. She's settling into a routine with her four new mates, learning the language, making new friends, and trying desperately not to fall apart whenever she thinks about how she ended up here. While the language barrier is beyond frustrating, it's easy to fall in love with Maalik, Caelan, Audun, and Reule.

The four Guardians have made it clear they'll go to any lengths to reunite Isla with her best friend. When they learn that Alistair is a demon, and that Isla might very well have two other supernatural mates searching for her as well, they're torn. They don't want to lose the best thing that's ever happened to them, but they want to do right by Isla-even if that means betraying their king and coming to terms with the fact that they've spent most of their lives acting like the monsters people always feared them to be.