Poirot claims: Sheppard's sister Carolina is a very outstanding woman. Thanks to her, now Poirot has in his hands a complete set of all kinds of rumors, and at the same time very valuable. Why didn't Sheppard tell everything from the start? After all, someone else could see Ralph in the forest, not only Carolina. Poirot invites the doctor to visit him, where he can hear the brilliant observations of the famous detective regarding the murder of Mr. Ackroyd. The offender did not enter the house, therefore, someone left the house to him. And it’s most convenient to meet in the arbor, where Poirot found a piece of feather and a piece of cambric. The maid was absent for too long - to leave, you need much less time than half an hour. Ralph needed money and went in the evening to Mr. Ackroyd. But he did not kill him. However, it was Ralph who left the window open, and then this way the killer got into Ackroyd’s office.