The last mystery list was aimed at teens, but this list is great for tweens! Just because summer's over doesn't mean you have to stop reading great mysteries. Check these out:
The Kidnappers: A Mystery by Willo Davis Roberts
11-year-old Joey Bishop's well-deserved reputation as a liar and teller of tall tales gets in the way of helping to solve a crime. When Joey accidentally hits the class bully in the nose, he knows it's only a matter of time before Willie seeks revenge. Hiding outside of his expensive New York City private school after most of the chauffeurs have come and gone, Joey witnesses the abduction of his worst enemy. By the time he convinces others of the truth to his story, he realizes that having seen the kidnapping is nearly as dangerous as being kidnapped. The fast-paced mystery unfolds with suspense and excitement, as Joey is nearly run down and
then abducted himself.
The Falcon’s Malteser: A Diamond Brothers Mystery by Anthony Horowitz
Thirteen-year-old Nick is the younger (and brighter) half of the Diamond Brothers, the world's worst detective agency. Johnny Naples becomes their client, entrusting the two with a mysterious package (a box of Malteser chocolates) just before he is killed, leaving Tim Diamond, literally, holding the gun. With Tim in jail, Nick is forced to solve the case--hopefully before someone murders him, too. Horowitz has a classic cast of quirky villains-- including The Fat Man, Gott and Himmel, Beatrice von Falkenberg, and the Professor--plus nonstop action and clever, deadpan humor. (first in the series)
Dovey Coe by Francis O’Roark Dowell
Her family has been in the mountains "since the beginning of time." They own their land and are one of the few families who are not beholden to wealthy Homer Caraway. Dovey guards her siblings closely. She taught her deaf older brother how to read books and lips, and worries about her older sister, Caroline, who seems to have forgotten her plans to go to teacher's college after uppity Parnell Caraway (Dovey's least favorite person) starts calling on her. When Parnell is murdered, Dovey is accused of the crime and stands trial. Dovey may be headstrong and have a sharp tongue, and she certainly hated Parnell, but is she capable of murder?
The Westing Game by Ellen Raskin
When an eccentric millionaire dies mysteriously, sixteen very unlikely people are gathered together for the reading of the will. An unusual assortment of heirs must uncover the circumstances of his death, before they can claim their inheritance. The sixteen characters offer a hilarious dialogue, a puzzling mystery and a wild adventure.
The Last Treasure by Janet Anderson
The dreams have started. Ellsworth is having dreams of houses surrounding a beautiful green square. Suddenly a letter arrives, inviting Ellsworth to a home he doesn’t remember: the Square in Smith Mills, New York . A home with a hidden treasure only a child can uncover-the last treasure of John Matthew Smith, the family’s eccentric patriarch. But there are other things hidden in the Square. Can Ellsworth set these ghosts to rest and uncover the family’s last treasure-or will the secrets of the past haunt him forever?
Assassin by Patricia Finney (first in the Lady Grace mysteries)
Thirteen-year-old Lady Grace Cavendish, favorite maid of honor Queen Elizabeth 1, must solve a murder mystery and clear the name of her betrothed. It is up to Grace to use her intelligence, stealth, and curious nature to solve the mystery that threatens the very lifeblood of England. This is the first book in a mystery series featuring the feisty and independent Lady Grace and is written as a diary.
Chasing Vermeer by Blue Balliett
When a book of unexplainable occurrences brings Petra Andalee and Calder Pillay together, strange things start to happen: Seemingly unrelated events connect, an eccentric old woman seeks their company, and an invaluable Vermeer painting disappears. Before they know it, the two find themselves at the center of an international art scandal, where no one -- neighbors, parents, teachers -- is spared from suspicion.
The Thieves of Ostia by Caroline Lawrence
The place is Ostia, the port of Rome. Flavia Gemina, a sea captain's daughter, is about to embark on a thrilling, fast-paced adventure set in ancient Rome. When the dogs on Flavia's street start dying, she is determined to find out who is killing them--and why. Her investigation leads her to three extraordinary people: Jonathan, her new neighbor; Nubia, an African slave girl; and Lupus, a mute beggar boy. They become firm friends as they search for the killer, narrowly escape being kidnapped by a slave dealer, and uncover a series of burglaries.

Missing Abby by Lee Weatherly
When 13-year-old Emma bumps into her old friend Abby on the bus one Saturday afternoon, she later realizes that she was the last person to see Abby before her mysterious disappearance. Amidst the media frenzy and everyone's struggle to come to terms with the possibility of Abby's death, Emma starts a terrifying journey of her very own, as she uncovers things that lead to a discovery even the police have not considered.
Operation Red Jericho by Joshua Mowlls (first in the Guild Specialists series)
Excerpts from fifteen year old Rebecca MacKenzie document her adventures, along with her brother Doug, in 1920s China as the siblings are sent to live aboard their uncle’s ship where they become involved in the dangerous activities of a mysterious secret society.