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.