A water devil is loose! All kinds of things happen in the easy-reading and exciting Monster Care series.

Lili and Lotta are spending their summer in the Monster Manor, a place that takes care of monsters. During the night, Lotta starts feeling homesick, but, luckily, her mind becomes occupied by a puzzling task: they have to catch an injured water devil who has left puddles all over the floor. How will they coax the elusive creature out of hiding?