Hmmmm . . .
(Mysteries to keep you wondering)

Holes, Louis Sachar

Face on the Milk Carton, Caroline Cooney

Whatever Happened to Janie?, Caroline Cooney

Killer's Cousin, Nancy Werlin

Tangerine, Edward Bloor

Silent to the Bone, E. L. Konigsburg

Coverup, Jay Bennett

Series of Unfortunate Events, Lemony Snicket

Look for Me by Moonlight, Mary Downing Hahn

Driver's Ed, Caroline Cooney

Missing, Caroline Cooney

Ruby in the Smoke, Philip Pullman

Nathan's Run, John Gilstrap

Running out of Time, Margaret Peterson Haddix