Sherlock Holmes & the Christmas Demon by James Lovegrove
I've enjoyed a lot of "new" Holmes stories, and I don't need Holmes to necessarily be Doyle's Holmes, but Lovegrove's does come pretty doggone close. Eve Allerthorpe, daughter of a wealthy Yorkshire family, enlists the help of Sherlock Holmes and Doctor Watson because she believes her family home is being haunted by the Black Thurrick, a kind of anti-Father Christmas. She has found bundles of birch twigs at the castle and seen the Black Thurrick walking across the frozen lake at night. Also, one of the wings of the castle is supposedly haunted. Holmes, of course, is skeptical, but he does suspect that something criminal is afoot. And his suspicion is justified when, soon after he and Watson arrive at Felscar Keep, a member of staff is found dead, pushed from an upper window.
The setting is perfect, a secluded Gothic castle surrounded by frozen water and a snowy forest, a place where you could believe in ghosts and demons. The...