Friday the 14th

Plot:

A fishing trip to Cornwall is on the cards for the Trotters, with a stay in Boycie's empty weekend cottage. However, on arriving on a dark, stormy night with powerlines in the area down, they are stopped in a police roadblock and informed that an escapee from the local hospital for the criminally insane is on the loose. Could this be the start of a horror story for the unwitting Trotters?