A carefully prepared crime is very hard to investigate. And if it happened eleven years ago, then exposing the culprit is almost impossible. Armand Crowlin committed suicide—that’s the official version. But his wife is not convinced—she believes he was murdered. She turns to the expert-analyst Drongo. There are no clues indicating cold-blooded, calculated murder. Except, perhaps, for one small thing—something she gives Drongo.