Secret in the Dorm Attic(1990)
(The second book in the Flying Fingers Club series)
A novel by Jean F Andrews
While visiting his friend Matt on the campus of his special school for the deaf, nine-year-old Donald discovers something strange going on in the attic of Matt's dorm and becomes involved in the theft of a priceless necklace from a nearby museum.
April 1990 : USA Paperback