I cannot describe this in any other but the words of David Rudkin himself:

“Young Stephen, in the last summer of his boyhood, has somehow awakened a buried force in the landscape around him. It is trying to communicate some warning, a peril he is in; some secret knowledge; some choice he must make, some mission for which he is marked down."

A brilliant piece of film making, a coming of age drama with shades of Bernard Quatermass, M.R. James, and Lindsay Anderson. A beautiful relic from a time when the little box occassionally gave us complexity and wonder instead of "reality."