The secret agent Colin Lamb is investigating the condominium Wilbraham Crescent, located in the small town of Crowdean, when
he finds himself involved in the investigation of a murder that occurred there. In the living room of the house No. 19 owned by a blind lady, Mrs Pebmarsh, was found, apunhalado, the corpse of a man unknown. In place of the crime were also found four
watches that do not belong to the owner of the house and, curiously, all marked the same time, 4.13h. Who discovered the body was Sheila Webb, a estenógrafa who received orders to work for Mrs. Pebmarsh, but is now being that this not requested any work of estenografia. The case appears to be quite complex and Colin Lamb launches a challenge to his
friend Hercule Poirot. Decifrar the puzzle without leaving their armchair, relying only on information provided by the friend.