Marty Volk has a guardian angel. For the past five years, since he was twelve years old, it has saved Marty whenever he's been in danger. And from a single darkened glimpse one night on the streets of London, he thinks it's his long-lost sister Rose--ten years older than him, beautiful, intelligent . . . and deceased. For Rose has become a creature of legend that thrives, along with her undead companions, in the shadows of the human world . . .

In this You Choose mystery, Scooby Doo and the gang are on a cruise, right through the Bermuda Triangle! Suddenly, a ghost interrupts a costume contest, sending everyone running. Readers choose which characters to follow. Will your path lead to dangerous criminals, confused passengers, or a real ghost? Solve the mystery again and again!

Velma's uncle, a famous archeologist, asks the gang to visit his dig site in Mexico. It seems something is scaring his workers, and he needs to get to the bottom of it. But when Scooby-Doo and the gang arrives, the dig is empty and Velma's uncle is missing! Where did he go and what's scaring everyone? To solve the mystery, readers choose which characters to follow, discovering what seems to be Aztec ghosts and monsters along the way.