""Glencannon and the Ailing Cockroach"" is a novel by Guy Gilpatric, originally published in 1942. The book is part of the Glencannon series, which follows the adventures of a retired sailor named Angus ""Mac"" Glencannon. In this installment, Glencannon finds himself embroiled in a mystery when a wealthy businessman hires him to investigate a series of strange occurrences at his estate in the Caribbean. The businessman suspects that someone is trying...