The book "Hercule Poirot's Christmas" by Agatha Christie

"Hercule Poirot's Christmas" by Agatha Christie is another detective novel featuring the already famous Belgian private detective. The novel was first published in 1938. In Great Britain. And later in the USA it was also released under the titles "The Christmas Killer" and "A Feast for a Murderer". This time Hercule Poirot is faced with the task of solving a family tragedy. On Christmas Eve, locked in their own room in the Gorston Hall mansion, family members discover the body of millionaire Simeon Lee, completely covered in blood. The murder hypothesis is undeniable, but solving the mystery is not so easy. After all, the murder victim was hated by almost everyone. It's really time to use the gray cells.