Edgeways On

What is the connection between the unidentified corpse of a north African on a forestry trail up a mountainside in a Spanish National Park, a birdwatcher on horseback, a red motorbike, 2 missing British tourists, and a shoot-out at a filling station? Sergeant Luis Hortez of the Guardia Civil in Grazalema thinks things out and examines a puzzle from every angle, including 'Edgeways On'. On this occasion he refuses to be put off by a rather pompous stand-in chief who thinks he has the answer and finds ways to follow up alternative leads.