Henry, Jessie, Violet, and Benny are spending a week on a houseboat! Throughout the journey, the children have the feeling they are being watched--and they are. Someone wants something that's hidden on their boat, and they'll stop at nothing to get it.

"There are a few things you should know about Harriet Wermer: She always tells the truth. She's loving spending her summer on Marble Island, where she is an A+ mystery-solver. Okay, maybe she doesn't always tell the truth. Actually...she has a tendency to lie quite a bit. Which is why, when one of the guests at her grandmother's bed-and-breakfast finds that their treasured pair of binoculars has gone missing, no one believes Harriet when she said...

Second-grade detectives Jigsaw, Mila, and their friends follow clues when a girl reports seeing a glow-in-the-dark ghost dancing at night in their school.

The Alden children have an adventure as they journey along with the Little North Railroad in two cabooses rented for the summer by their grandfather.

The Mighty Muskrats are off to the city to have fun at the Exhibition Fair. But when Chickadee asks Grandpa what he would like them to bring back from the city, she learns about Grandpa's missing little sister. She was, they learn, scooped years ago-like many Indigenous children, the government had arranged for her adoption by strangers without her parents' permission. Now the Mighty Muskrats have a new case to solve: uncovering the whereabouts of...

"Dear Diary...Bess, George, and I are actually in Alaska! Everywhere you look, there are massive mountains and sparkling, deep-blue waters. We're on the maiden voyage of the Arctic Star luxury cruise ship, and my old friend, Becca Wright, the assistant cruise director, needs our help. She received threatening emails before even setting sail; then a bloody body turned up in the swimming pool. And when a chandelier came crashing down in the dining room,...

Summer is here, school is out and there's...nothing to do?! Since grown-ups invaded the skating rink, there's nowhere for Mina's friends to hang out. Luckily, a high-stakes competition is about to mark the opening of a new skate park. As everyone gets weirdly intense about it, Mina faces a string of mysteries. Who stole her cousins' new bikes? What does Gareth Trumpshaw want? And who keeps levitating past her window?

"Twelve-year-old Ellie “Scaredy Bat” Spark would give her fangs to prove herself and become a real detective. So when she learns the jellyfish at the lake have vanished, she jumps at the chance to solve the puzzle. But if her fear of boggy water stalls the case, the park will close and her best friend's dream of going to science camp will be dashed. With only one day to unscramble the riddle, Ellie tries to ignore her dread of swimming and recruits...

"The Alden children are helping their new neighbors build a tree house when they discover an attic window that not even their neighbors knew about"--Title verso page.

When a thief breaks into the P.E. lockers, leaving behind cryptic ransom notes, Drew Leclair, who is determined to stay out of trouble, investigates while dealing with her friends' obsession with the upcoming Wonderland dance.