Mystery and detective stories 
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Showing 1 - 2 of 2
There are a total of 33 valid entries on the list.
1. Camp Cosmo
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Description:
Twin sisters and budding geniuses Wiki and Leen Ellison have never been apart, but this summer Leen is going to Cosmos Camp and secretly Wiki is looking forward to being alone--but when the camp founder disappears both girls are recruited to solve the mystery before his newest invention goes terribly wrong.
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Series:
Sinister summer series volume 1.
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Description:
"Meet the Sinister-Winterbottoms: brave Theo, her timid twin, Alexander, and their older sister, Wil. They're stuck for the summer with their Aunt Saffronia, who doesn't know how often children need to eat and can't use a smartphone, and whose feet never quite seem to touch the floor when she glies--er--walks. When Aunt Saffronia suggests a week pass to the Fathoms of Fun Waterpark, they hastily agree. But the park is even stranger than Aunt Saffronia....