In the story, Mourad has stolen John Byro's beautiful white horse. Having had a wonderful time riding the horse, Mourad eventually invites Aram to ride with him. They hide the horse in a barn at a deserted farmyard when they are not riding. Neither cousin is enthused about returning such a prized animal despite the famous Garoghlanian honesty and integrity.
It is obvious that Mourad has a way with animals; he is as confident in nursing a young robin with an injured wing as he is in corralling a frightened horse when its fear causes it to flee. One day, the farmer John Byro comes to visit Aram's family. He opines about his lost white horse, but Uncle Khosrove wears him down with his intimidating manner.
Eventually, both boys run into John Byro, who is on his way to town. They exchange pleasantries and John asks the boys what the name of their horse is. Mourad answers that the horse is called 'My Heart,' which is an interesting maneuver on Mourad's part; no farmer would fail to notice the affectionate name it has been christened nor the current pristine condition of the horse. Indeed, John merely points out that the horse looks identical to his stolen horse. He asks to look into the horse's mouth and proclaims that 'tooth for tooth,' the horse could be the twin of his own horse.
John Byro knows that the horse is his, but refuses to embarrass the boys. Instead, he asserts that the boys could not have been the thieves who stole his horse because the famed honesty of the Garoghlanian family is well known to him. He further disarms the boys by stating that he will trust his heart rather than the evidence of his eyes. With that, the two parties go their separate ways. The next day, the cousins return the horse to John Byro's barn.