There is an attack on camp. Worse than any they’ve ever seen. And more terrifying—because the objective of the monsters is killing Onyx, Nico and Will’s child. Nico and Will do their best to keep them by their side, but there are hundreds of monsters, and they get separated. Now they’re dying, and alone, hoping desperately that their dads will find them in time so they at least have a chance to say goodbye if they don’t survive this.