Thirteen-year-old Sully Stringfellow, his arch-nemesis Izzy Cisco, friend Moleman, and a league of long-forgotten plumber heroes team up to save Nitro City from mutant creatures in the sewers.

"Now that Hyacinth Hayward knows about the enchanted rivers under London, she's determined to find out more. Unfortunately, London isn't cooperating. Instead, Hyacinth stumbles on a new adversary--a girl who is trying to steal all the ancient stones that keep the city in balance. A girl with glowing, magical fingers, whose entire body is tattooed with spells. A girl called Minnie Tickle. (What? Were you expecting something more . . . fearsome?) To...

Six months after vanishing into an underground silo with sixty others, Wynter and Chase emerge to find the area abandoned. There is no sign of Noah and the rest of the group that was supposed to greet them when they emerged--the same people Wynter was counting on to help her locate the IV antibiotics her gravely ill friend, Julie, needs in order to live. As the clock ticks down on Julie's life, Wynter and Chase embark on a desperate search for medicine...