Calliope Silversmith has never wanted anything more than her two best friends and her moms--except maybe knowing who her sperm donor is. Then Max moves into the house across the woods from Calliope, and she immediately feels a romantic connection with her new neighbour. But then Calliope learns a surprising truth: her donor is Max's father. As she and Max struggle to redefine their friendship now that they know they're half-siblings, Calliope realizes she has much to gain by recognizing and accepting that family is both the one she has been born into, and the one she chooses to make.