Henry, Jessie, Violet, and Benny are excited to learn more about raptors when they volunteer at a rehab center for wild birds, but not long after they arrive, a series of strange events makes it seem like someone might be trying to sabotage the center.

Hidden behind the wall of their guest room, a mysterious journal leads the Aldens on a search for a valuable collection--

Eddie Becker has the idea of a lifetime, and creates plans for what he promises is going to be a million-dollar invention. Then the plans get stolen. Worst of all, after Jigsaw does some digging, he suspects the principal may be the thief! Now Jigsaw has to invent a gadget of his own to find out the truth.

After years in foster care, April gets to live in a mansion where she and four other children are caught up in a mystery related to a missing heir, a lost legacy, and the Phantom.

The Aldens are spending spring break on a beach, but they aren't just soaking up the sun. They're protecting an endangered species! Their job is to mark sea turtle nests so the eggs can be moved to a safe place to hatch, but someone is digging up the eggs without permission. Can the Boxcar Children figure out what's going on and help save the sea turtles? --

When six-year-old Beatrice Willoughby vanished at the Amadeuses' annual All Hallows Eve party, people in the tiny mountain town of Nevermore were quick to whisper: They were always odd. Their house is full of dark magic. And when Mort Amadeus was pegged for the crime, the Amadeuses, once the center of society, retreated. They closed their doors, disappeared from life. People almost forgot. Until thirteen years later, when six envelopes land at the...

"Billie and the Secret Mystery Club are investigating their most serious mystery yet. Something has been taken from the principal's office at school! Who could have done such a terrible thing? And when one of Billie's friends becomes a suspect, will Billie even know who to trust anymore?"--Back cover.

The Chicken Squad uncovers mysterious remains while digging a meteor/storm shelter, and they stop work to investigate just as a big storm is approaching.

When they journey to Alaska to help their friend, Tony Prito, who feels his life is in danger, the Hardy brothers find their own lives threatened.

Melody Bird is fascinated by the walled off plague house she discovered near the the graveyard, but she is even more fascinated by the mysterious boy, Hal, she finds living there in secret; he tells her he is a spy-in-training, a story that Melody's friends Matthew and Jake do not believe, and they set out to find out more--and uncover a riddle even more confusing than Hal's spy story.