Murder Among Apples by Holly Newman

At Pomum Court, the land keeps its secrets. But some refuse to stay buried.

When Cecilia and Sir James Branstoke arrive in Devon at the request of the Earl of Monteith, James’s cousin, they expect to investigate a string of estate troubles—not murder.
Nearly two years earlier, Monteith’s older brother died in what was ruled a tragic accident. But accidents do not form patterns.
As Cecilia and James begin to observe the people—and silences—surrounding Pomum Court, they uncover an unsettling truth: every man who advised Monteith’s father in a dangerous decision that affected the estate’s future has died. One by one.