From the early 1960’s, a young boy invents various devices in his home to solve mysteries. He can’t wake up, so he invents an alarm clock with string attached to his toe – alarm goes off, string winds up and tugs his toe. Does he invent a periscope to spy on a suspicious neighbor?
Name might have been Henry (perhaps with alliterative last name). Several books were published with his adventures, thin young (young?) adult fiction.
