Roger's eccentric, junk-collecting friend Kenneth takes him on an awesome undersea ride in a homemade submarine. Their visit to a subaqueous cavern turns up a wonderful surprise: a cache of supervaluable baseball cards!

Jon Buller and his wife, Susan Schade, have been writing and illustrating children's books for more than 20 years and have published more than 30 works, including The Noisy Counting Book, 20,000 Baseball Cards Under the Sea, Toad on the Road, and I Love You, Good Night. They live in Lyme, Connecticut.