Knife Edge

Inspiration for Amazon Prime's Young Sherlock Series, directed by Guy Ritchie

Teen Sherlock battles a monstrous adversary on a mission to Ireland with his brilliant brother, Mycroft. Young Sherlock is thrown into a tangled web involving a spiritualist whose powers have attracted the attention of governments around the world. At the castle where the medium is demonstrating his "gift," Sherlock finds a household in turmoil. Servants and some of the guests are frightened but who—or what?—has t...