Frozen

Frozen is a 2005 British psychological thriller film directed by Juliet McKoen. It features Shirley Henderson, Roshan Seth and Ger Ryan. Set in Fleetwood, on the Fylde coast, in North West England, it was filmed in and around the town and also on location in Scotland and Sweden. It is a tale that has the viewer undecided whether it is a ghost story or a murder mystery right until the final climactic moments.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.