From Ryan La Sala, the wildly popular author of Reverie, comes a twisted and tantalizing horror novel set amidst the bucolic splendor of a secluded summer retreat.

Mars has always been the lesser twin, the shadow to his sister Caroline's radiance. But when Caroline dies under horrific circumstances, Mars is propelled to learn all he can about his once-inseparable sister who'd grown tragically distant.

Mars's genderfluidity means he's often excluded from the traditions — and expectations — of his politically-connected family. This includes attendance at the prestigious Aspen Conservancy Summer Academy where his sister poured so much of her time. But with his grief still fresh, he insists on attending in her place.

What Mars finds is a bucolic fairytale not meant for him. Folksy charm and sun-drenched festivities camouflage old-fashioned gender roles and a toxic preparatory rigor. Mars seeks out his sister's old friends: a group of girls...