“Club Tropic Karma on the island of Koh Fun, southern Thailand, is a new luxury dive and spa destination owned by British property magnate Rich Long. Eight guests gather in the Beachview bar in the early evening; each has received an anonymous invitation. That morning the body of Bang, the hotel masseur has been found on the beach. She was discovered by hotel staff at 6am, but no alarm was sounded or police called. Two half-finished cocktails were near the body, along with a mysterious symbol drawn in the sand. As the last to leave the bar the previous night, all eight guests are suspects. One is a murderer. At…