Whistle and I'll Come to You (2010)

Elderly scholar James Parkin seeks solace in a desolate winter hotel, a former retreat for him and his ailing wife, Alice, now residing in a care facility. The tranquil atmosphere quickly shifts as unsettling occurrences plague him at night, suggesting he might be haunted by a spectral force. As he grapples with his grief and isolation, the identity of the mysterious avenger remains shrouded in mystery, leading to a chilling confrontation with the past that compels him to confront his own regrets and losses.