Waking up on a cool, sunny morning, John went into the yard of his own house and noticed that there was a deafening silence on the street. There were no passers-by on the street, cars were not driving, no movement was visible in the windows of neighboring houses. This alerted the hero and he decided to find out what was wrong. For a start, he looked to his neighbors, they are familiar and friendly. The door was open, but there was not even a cat in the house, the mistress's favorites. Things are scattered around the rooms, the furniture is turned upside down. To find out the cause of the disappearance of people and animals in A Grim Secret, you need an investigation and you will spend it with the hero. He goes to check whether there is anyone left in the city, in you, while you collect the items that he needs.