Psychology doctor Weissman dies in a tragic accident. His longtime acquaintance, archaeologist Austin, unexpectedly inherits the results of Weissman's scientific work. Austin is at a loss, but later it turns out that Austin’s excavations of the Hittite civilization in Turkey are somehow connected with the work of Weissman. He soon begins to suspect that Weissman's death was not so accidental. However, how and who could have interfered with the research of a harmless psychologist?