Who could want the death of prominent businessman Rex Fortescue? Almost everyone who knew him. Therefore, when Rex's life was cut short as a result of drinking a cup of poisoned tea, there were too many suspects, even for the astute Inspector Neil. But the unrivaled Miss Marple, of course, knows the killer. And they will help expose him... grains of rye found in the pocket of the murdered man. Based on the novel “Grains in the Pocket,” the film “The Secret of the Blackbirds” was made in the USSR in 1983.