The Loney

"Two brothers. One mute, the other his lifelong protector.
Year after year, their family visits the same sacred shrine on a desolate strip of coastline known as The Loney, in desperate hope of a cure.
In the long hours of waiting, the boys are left alone. And they cannot resist the causeway revealed with every turn of the treacherous tide, the old house they glimpse at its end...
Many years on, Hanny is a grown man no longer in need of his brother's care."