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The Westing Game by Ellen Raskin
The mysterious death of an eccentric millionaire brings together an unlikely assortment of heirs who must uncover the circumstances of his death before they can claim their inheritance.
If you liked The Westing Game you might like:

The Beekeeper's Apprentice, or On the Segregation of the Queen by Laurie King
Sherlock Holmes takes on a young, female apprentice in this delightful and well-wrought addition to the master detective's casework. In the early years of WW I, 15-year-old American Mary Russell encounters Holmes, retired in Sussex Downs where Conan Doyle left him raising bees. Mary, an orphan rebelling against her guardian aunt's strictures, impresses the sleuth with her intelligence and acumen. Holmes initiates her into the mysteries of detection, allowing her to participate in a few cases when she comes home from her studies at Oxford. The collaboration is ignited by the kidnapping in Wales of Jessica Simpson, daughter of an American senator. The sleuthing duo find signs of the hand of a master criminal, and after Russell rescues the child, attempts are made on their lives (and on Watson's), with evidence piling up that the master criminal is out to get Holmes and all he holds dear. (Publishers Weekly Review)

Chasing Vermeer by Blue Balliett
When seemingly unrelated and strange events start to happen and a precious Vermeer painting disappears, eleven-year-olds Petra and Calder combine their talents to solve an international art scandal.

Down the Rabbit Hole: An Echo Falls Mystery by Peter Abrahams
Welcome to Echo Falls. Home of a thousand secrets, where Ingrid Levin-Hill, super sleuth, never knows what will happen next. Ingrid is in the wrong place at the wrong time. Or at least her shoes are. Getting them back means getting involved in a murder investigation rivaling those solved by her idol, Sherlock Holmes, and Ingrid has enough on her plate with club soccer, school, and the plum role of Alice in the Echo Falls production of Alice in Wonderland . But much as in Alice's adventures down the rabbit hole, things in Ingrid's small town keep getting curiouser and curiouser.

The Egypt Game by Zilpha Keatley Snyder
A group of children, entranced with the study of Egypt, play their own Egypt game, are visited by a secret oracle, become involved in a murder, and befriend the Professor before they move on to new interests, such as Gypsies.