Entering Grade Four
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MYSTERY
Art Auction Mystery by Anna Nilson
Famous paintings all over the world have been replaced with forgeries. You have copies of the paintings and the dossiers on the best forgers. It's up to you to solve the mystery.
Bunnicula and Friends series by James Howe
Book 1: Bunnicula: A Rabbit Tale of Mystery by Debra Howe and James Howe
Harold the dog becomes very worried when the humans bring home a pet rabbit they found at a showing of the movie Dracula. The bunny's strange red eyes and suspiciously sharp fangs are bad enough, but then all the vegetables from the fridge are found drained of color.
The Cabinet of Curiosities: 36 Tales Brief and Sinister by Stefan Bachmann and others
Mysterious and eerie short stories from a number of authors will delight and thrill.
Charlie & Frog series by Karen Kane
Book 1: Charlie & Frog: A Mystery
An old woman gives Charlie a message in sign language, and then disappears. Charlie must enlist a new friend to decipher the message and find out what the woman wanted and where she could have gone.
J.J. Tully Mystery series by Doreen Cronin
Book 1: The Trouble With Chickens
J.J. is a retired search and rescue dog, who would really rather not deal with chickens. However, when a chicken comes to him with a tale of missing chicks being held for ransom, he reluctantly takes the case.
Max Finder Mystery Collected Casebooks series by Liam O'Donnell
Max, a fan of Sherlock Holmes, and his friends use their skills to investigate mysteries in their hometown of Whispering Meadows. Each volume contains ten mysteries, with solutions at the end. (graphic novel)
Muddy Max: The Mystery of Marsh Creek by Elizabeth Rusch
Max can't figure out why his parents are such clean freaks. Then he discovers that being covered in mud gives him superpowers. What then is the connection between Marsh Creek and his family? Max and his friends vow to find out. (graphic novel)
Poptropica series 
Book 1: Mystery of the Map by Jack Chabert
When friends Oliver, Mya and Jorge go on a hot air balloon ride, they do not expect that the captain will strand them on an uncharted island full of extinct animals and VIkings. (graphic novel)
Ra the Mighty series by A.B. Greenfield
Book 1: Ra the Mighty: Cat Detective
Pharoah's cat Ra likes the easy life, but his friend Khepri the scarab beetle convinces him he needs to investigate a missing amulet and save a servant girl framed for the crime.
Secret Agent Jack Stalwart series by Elizabeth Singer Hunt
Book 1: The Escape of the Deadly Dinosaur
Someone has stolen an allosaurus toe from the Natural History Museum in New York CIty, and is using it in a genetic experiment. Now Jack must stop a rampaging creature that is terrorizing the city.