Murder at Bratton Grange

Sir Hector Davidson is the president of Davidson's, a London manufacturer of laboratory equipment. His cousin, Guy Davidson, was drummed out of the business so Hector could milk all the profits to himself. Hector gives notice to his chief designer, Philip Lowry, because of a patent condition which gave Lowry 30% of the profits. Hector dismisses Lowry early one afternoon, and once he is out of the way, packs up a crate with the valuable patterns of their product. He takes the box on the train to Bratton Grange. He obtains a ride from the station with Tom White, riding in the back of the van, sitting on the box. When the van arrives at Bratton Grange, Hector is found dead inside of a stab wound. Guy  Davidson enlists the help of Dr. Priestley and his assistant Harold Merefield to investigate. It is a puzzle, Hector was alive at the start of the ride, but dead at the end - inside a closed van. RM