Uncanny, Halloween: Trilogy of Terror, Halloween Special: Meadow Cottage - BBC Radio 4

A brand new case for Halloween. Helen, her husband and baby son move into a 200 year-old house in the Lake District. At first all is fine, but one October morning they open their front door to find a pile of small stones on their doorstep.

The odd incident sets into motion a series of terrifying events that lasts for the next 18 years…

That's part 1 and part 2 is also available:

For the last of our chilling Halloween episodes, we return to Meadow Cottage for the gripping second half of this brand new investigation into a terrifying haunting in the Lake District that spanned two decades.

As Helen’s young son Jake grows up, events take an even more sinister turn. What is going on in that house?