The cover of the novel Six Counties Seven Sins features a photograph of the entrance door of Lisbane Church, located on the shores of Strangford Lough at Saltwater Brig. Lisbane Church was the model I used when creating fictional Béalbéar Church, where the final scene (among others) of the novel is set. As in the novel, the actual church is indeed only opened once a year on All Soul’s Day; however, in reality it is not the priest of Dunshane Cross who holds the key, but rather the barman of the adjacent The Saltwater Brig pub and restaurant.
Lisbane Church was featured in the 1991 Irish movie December Bride. Here is the trailer: