Another Agatha Christie is $2.99 on Amazon:
Hercule Poirot's Christmas
It is Christmas Eve. The Lee family reunion is shattered when the tyrannical Simeon Lee is found dead in a pool of blood, his throat slashed. When Hercule Poirot offers to assist, he finds an atmosphere not of mourning but of mutual suspicion. It seems everyone had their own reason to hate the old man.