Growing up, Adrien and his sister Grace competed for everything. It wasn't easy being the adopted sibling, but Adrien tried to get along; Grace didn't. When their scientist parents died, they drifted apart. In their senior year, they are both back at the boarding school where their parents taught. Life gets more complicated when Adrien starts to suspect that Grace might be stealing their parents' research and claiming it as her own--or worse, that...

The Aldens investigate when an old wooden mask they have found is stolen.

"Something's lurking beneath the famous staircase at The Jefferson, Richmond's historic downtown hotel. Back in 1895, when the hotel opened, real alligators roamed free in the courtyard fountains. That was ages ago...or was it? When young brothers Sam and Derek arrive the The Jefferson for an elegant wedding weekend with their parents, they love exploring the old hotel. But when the wedding rings go missing and Sam is blamed, the boys and their friends...

While spending two days touring a zoo to see the baby animals, the four Alden children, aged six to fourteen, help catch an escaped monkey, participate in a photography contest, and investigate a missing camera.

Using her excellent memory, Cam Jansen, aided by her friend Eric, investigates the disappearance of Mrs. Scott's valuable pearl necklace during a charity brunch.

"Sure, Jackson and Quigley might officially be too young to join the FBI, but they aren't going to let that stop them! They just need to come up with the right plan to prove that they are worthy. But when one of Q's inventions goes dangerously wrong, Jackson suddenly finds himself dropped right in the middle of an FBI stakeout. There's fishy business afoot at the city's aquarium; rare fish are vanishing and not even the FBI can work out what's going...

Cam Jansen sets out to solve the mystery of Danny's parents' missing car before the famous mystery writer Jim E. Winter, who is signing books at the school, does.

The Aldens are visiting friends for a big Dia de los Muertos celebration. The kids love learning about the holiday and helping out - that is until mysterious events threaten to ruin everyone's preparations. Can the Aldens figure out what's going on and help their friends save the celebration?