The Super Secret Monster Patrol battles the Hydrant-Hydra, a clean-freak water monster! Sound the alarm -- things are heating up in Stermont! The Super Secret Monster Patrol arms themselves with water balloons to take on their hottest monster yet. But when puddles appear in the streets and the town starts to flood, Alexander and his friends realize there's a different monster splashing about! Get ready for an epic water battle in this fully illustrated, action-packed adventure from New York Times bestselling author-illustrator Troy Cummings!