When a sudden storm sweeps Larry the platypus far from home, he finds himself stranded in the twisting, shadowy storm drains beneath Mapleford. Armed with nothing but his wits and oddly useful platypus skills, Larry must dodge relentless humans, solve tricky puzzles, and uncover hidden routes. He may be small, but he's clever. Can Larry outsmart the city and make it back to the river dam before he's caught for good?