Caught in the Act — John Lee

Caught in the Act -- Lee's first novel was set in Spain. Brian Douglas, divorced American photographer with a weakness for the bottle, is in the wrong place at the wrong time and shoots a picture that gets him in deep trouble. He runs for his life, circling through Spain to seek answers that will clear him. In the process he must clean the sludge from his personal carburetor. Published in 1968 by William Morrow, then in paper and four languages.