As a last reprieve before being sent to a juvenile detention facility, Ernie is allowed to spend three weeks on a working farm. When Ernie arrives at the home of Russ Frazier, he learns that the widower’s baby was kidnapped years before, leaving behind a red quilt as the single piece of evidence.  Fascinated by the town’s famous “Quilt Baby” kidnapping, Ernie is determined to solve the case. He teams up with Joey, a local tomboy, to investigate clues that lead them on a dangerous journey into a forbidden world of dark secrets, magic puddles, and the cavernous underground kingdom of the Puddlejumpers— eleven-inch tall water creatures with whom Ernie has a mysterious connection.

When destiny summons, Ernie must find the courage to save the Puddlejumpers from the Most Dark and lead them in battle against their mortal enemies. Only then can he find his way home.