Pilgrim's Rest — Patricia Wentworth

They call it Pilgrim's Rest, but only the dead rest here. The scene of so many strange accidents that the house seems almost haunted, Pilgrim's Rest is now home for: lovely Judy Elliot and her young niece, the two eccentric Miss Pilgrims, Cousin Roger, and Captain Jerome Pilgrim, an invalid and virtual prisoner of his nurse, Miss Day.

Roger fervently believes his father's death was not an accident -- that a murderer stalks Pilgrim's Rest, a murderer who wants Roger to be the next corpse. Now it's up to the unflappable Miss Silver to catch a killer before the Pilgrims disappear, one by one...