Pilgrim's rest.

The two Miss Pilgrims, Columba and Janetta, think it unwise to leave their fine ancestral home, Pilgrim's Rest. When their brother suffers a fatal fall only days after talking about selling it, and his son, Major Roger Pilgrim, barely escapes two nearly fatal "accidents," they suspect it deadly to leave. Thank goodness Miss Silver has come for a visit. Surely, her insight and intelligent observations will determine just why the house hates to be empty.

Roger Pilgrim and his relatives turn to veteran sleuth Miss Silver to catch a killer.

Miss Silver mystery #10

Alternate title: Dark Threat.