Tide Pool Troubles by Ashlyn Anstee (2021, Hardcover)

Tide Pool Troubles (Shelby & Watts) Great condition! No rips/tears/discoloration (there is residue from a sticker that was on the backside of the front page - see picture) There isn't a mystery that Shelby & Watts can't solve! They're saving the environment, one case at a time. Meet Shelby & Watts! Shelby loves a good mystery. And her best friend, Watts, is never without his encyclopedia. When Shelby gets a letter from Fred the hermit crab claiming that all the shells are missing from the beach, she and Watts are just the duo to help him. With Shelby's deductive skills and Watts's scientific knowledge, there's no case the two of them can't solve--one environmental mystery at a time!