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After the murder of Henk, the sales clerk of Swinkels, the owner of a bird shop in Amsterdam, Pieter Vermeer, a well-known archaeologist, and Hélène, his air hostess daughter, get mixed up in a case of illicit smuggling of art objects between Thailand and Holland. With the agreement of his half-brother Jan, a police commissioner in Amsterdam, Pieter decides to contact the treasure plunderers in Bangkok under the guise of a rich art-lover...