Endless Night — Agatha Christie

The people of Kingston Bishop said that anyone who owned Gipsy's Acre was courting sorrow and danger...was buying death...

But Mike and Ellie were in love. They would build their house on Gipsy's Acre, and their bright happiness would banish its evil past forever.

Then the threats began. The accidents. And the terror, as their shining dream suddenly became a nightmare of fear, betrayal--and murder!