When their older brother and sister move out, Basti n Silvano has one job: protect the secret world they've all shared since they were children. For years, the world under the lake has been not just a landscape of underwater trees, mythical alebrijes, and paint and paper coming to life; it's been a safe space for their neurodivergent brains. But when Lore Garcia finds their way in, everything changes. The world under the lake pulls Basti n and Lore in without warning, and makes Lore's own neurodivergence part of its landscape. The once-unshakable bond between the Silvano siblings fractures--their brother thinks Lore will be the ruin of their world, while their sister thinks there's more to the lake's magic than any of them know. And the mistakes Basti n will do anything not to repeat, and Lore will do anything to hide, find their way above and below the surface. As Basti n tries to hold both of their worlds together, Lore must decide how much they'll risk for the magic they're now part of, and for Basti n.