Tragedy at the Unicorn — John Rhode

A party of five yachtsmen check-in one late summer Sunday evening at the Unicorn, an old-fashioned country hotel on the south coast of England. A sixth guest, Dr Victor Grinling, known to the group, is also in residence. The next morning Dr Grinling's valet and confidential servant, Ferguson, discovers his long-time master dead in his bedroom -- poisoned. It soon transpires that each of the five crew of Levity had in one way or another, a motive for desiring an untimely death of the very rich, very difficult, Dr Grinling. Dr Lancelot Priestley is brought in to apply his unique blend of scientific analysis and human psychology to solving the mysterious death, ably assisting his old-sparring partner, Scotland Yard's Inspector Haslet.