The Pit-Prop Syndicate
"Seymour Merriman's holiday in France comes to an abrupt halt when his motorcycle starts leaking petrol. Following a lorry to find fuel, he discovers that it belongs to an English company making timber pit-props for coal mines back home. His suspicions of illegal activity are aroused when he sees the exact same lorry with a different number plate--and confirmed later with the shocking discovery of a body. What began as amateur detective work ends up as a job for Inspector Willis of Scotland Yard, a job requiring tenacity, ingenuity and guile..."--From publisher's description.