The Unicorn Murders

Sir George Ramsden returns to Britain from France with the mysterious "unicorn". The master thief Flamande vows to steal it mid-flight, while his rival, S?ret? chief Gasquet, boards to stop him. In Paris, ex-spy Kenwood Blake meets Evelyn Cheyne and is drawn into a deadly chase ending at the storm-bound Ch?teau de l'?le, where Ramsden's plane lands in emergency. Cut off by floods, the guests face an impossible murder - and a duel of disguises as the unicorn's secret is finally revealed.