Good Used. Holidaying At An Exclusive Island Resort, Hercule Poirot Is Fascinated To Discover That A Number Of The Guests Sense The Presence Of Evil Which They Attribute To The Beautiful Arlena Marshall. When Arlena Is Found Strangled On A Lonely Beach The Suspects Include Linda Marshall, Arlena"s Unhappy Step-daughter; Captain Marshall, Her Long-suffering Husband; Patrick Redfern, Her Current Paramour And Christine Redfern, His Jealous Wife.