Hydrant-Hydra: A Branches Book (the Binder of Doom #4): Volume 4

It has been a busy summer of makerspace projects at the library and monster hunting for the three members of the Super Secret Monster Patrol, and the puddles that are appearing all over town are a clue to the identity of another monster--an angry hydra water monster who is obsessed with cleaning up (literally) the town of Stermont, even if it means drowning all the messy children who live there.