The Danger Box by Blue Balliett

"Twelve words were painted in gold ink on the wall of an office in Dearborn, Michigan:

SURVIVAL OF THE FITTEST IS A DEADLY GAME. WHO CAN WIN FOREVER?"

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Summary: In small-town Michigan, twelve-year-old Zoomy and his new friend Lorrol investigate the journal found inside a mysterious box and find family secrets and a more valuable treasure, while a dangerous stranger watches and waits.

Scholastic Press; 306 pages