A man was stabbed to death in line for theater tickets. He has no documents with him. Nobody is looking for him. Even the labels from his not at all cheap clothes are carefully removed. There is no name of the victim, no motive for the murder. Does the case automatically fall into the unsolved category? Everyone thinks so except Inspector Grant. He believes: it is enough to find even the smallest clue - and the thread from it will reach to the killer... A famous actress is found murdered on the beach. The main suspect is the young man to whom she bequeathed her entire fortune. The young gigolo achieved his goal and got rid of his aging mistress - this is the general opinion. But Scotland Yard inspector Alan Grant considers this version too obvious. He quickly finds out: the victim had many enemies, and almost everyone had both the motives and the opportunity to kill her...