Billy and Sheena go with their Uncle, Dr. Deep, to search for treasure and are pursued by pirates who have been dead for two hundred years, and when Billy and Sheena return to land and visit Horrorland they encounter their worse fears.

"In the beginning, Byx's original quest was to discover if there were more of her kind, or if she was destined to become an endling--the last dairne alive. She did indeed find more dairnes, and along the way she also created allies among other creatures in her world, including humans, felivets, raptidons, and wobbyks. But Byx and her new friends soon learned that it wasn't just dairnes in jeopardy of extinction, but that everyone was at risk. With...

"Mabel Jones finds herself aboard the Feroshus Maggot--a ship crewed by the strangest bunch of pirates you'd (never) want to meet. She then has to find pieces of an X-shaped puzzle that in her hands could be her ticket home, but in the hands of Captain Split, they'd give him the power to assemble a pirate militia to take over London!"-- Provided by publisher. "Mabel Jones finds herself aboard the Feroshus Maggot--a ship crewed by the strangest bunch...