Twelve-year-old Teddy investigates when a popular Texas zoo's star attraction--Henry the hippopotamus--is murdered.
Enola Holmes, much younger sister of detective Sherlock Holmes, must travel to London in disguise to unravel the disappearance of her mother.
Twelve-year-old Kyle gets to stay overnight in the new town library, designed by his hero (the famous gamemaker Luigi Lemoncello), with other students but finds that come morning he must work with friends to solve puzzles in order to escape.
Two sisters start a detective agency and solve a series of everyday mysteries about themselves and their family.
At an English boarding school in the 1930s, crime-solving friends Hazel Wong and Daisy Wells struggle to find an exciting mystery to investigate until Hazel discovers the dead body of Miss Bell, the science teacher.
When ten-year-olds Shirley and Jamila meet, Jamila is simply hoping for a friend in her new neighborhood but Shirley is a detective and together they seek a missing gecko.
Twelve-year-old Ben Ripley leaves his public middle school to attend the CIA's highly secretive Espionage Academy, which everyone is told is an elite science school.
The mysterious death of an eccentric millionaire brings together an unlikely assortment of heirs who must uncover the circumstances of his death before they can claim their inheritance.