The Woman in Green (1945) on Netflix

Plot summary

In London, women are turning up dead, each body missing a forefinger, and Inspector Gregson can make no progress. He calls in Sherlock Holmes and Dr. Watson. Holmes examines the most recent victim and notes that the finger was taken with a surgeon's precision. At the Pembroke House bar, Holmes and Gregson talk over the case while Sir George Fenwick, a wealthy widower, keeps company with a young woman named Lydia Marlowe. Fenwick spends the evening at Lydia's apartment, where her maid Crandon mixes the drinks and a bowl of floating flowers holds his gaze. He wakes ten hours later in a shabby rooming house with a severed finger in his pocket and no memory of the night. His daughter Maude brings Holmes a finger she dug up in their garden.