"It was the strangest summer. It wasn't even that their parents left them with no warning or that they were living with an aunt they had never met before or that they were spending their days at a gothic nightmare of a water park and trying to solve the mysteries of the Cold Unknowable Sea..."

A great start to a funny, mysterious, vaguely spooky, sibling adventure series! Some of the word play made me laugh out loud, the characters were delightful, the plot and setting immersive, and the mystery within a mystery structure very compelling. I immediately requested the ARC for the next book in the series (coming in September!). The audiobook is also excellent — thanks to Libro.fm for an advanced listening copy).