Thirteen-year-old Clivo Wren learns that his recently deceased father was not an archaeologist as he was told, but rather a cryptid catcher, known for finding elusive mythological creatures, and now Clivo must pick up where his father left off and track down a cryptid whose blood grants immortality before the knowledge falls into the wrong hands.

When Kelly loses a little boy to monsters who live under his bed during her first babysitting job, she learns about a secret society of babysitters who fight monsters.

Twelve-year-old Cassie Arroyo is a student in Rome, but her life changes when a secret organization, the Hastati, shoots her father--and she learns that she is a member of an ancient bloodline that enables her to use the Spear of Destiny, a legendary object that can alter the future.

In 1665 London, fourteen-year-old Christopher Rowe, apprentice to an apothecary, and his best friend, Tom, try to uncover the truth behind a mysterious cult, following a trail of puzzles, codes, pranks, and danger toward an unearthly secret with the power to tear the world apart.

As the plague decimates London in 1665 and an assassin threatens the apothecary's life, apprentice Christopher Rowe and his faithful friend Tom, following a trail of puzzles, riddles, and secrets, risk their lives to untangle the heart of a dark conspiracy.