Samuel Hunter, Caitlin O'Sullivan, and Granville Woods battle supernatural forces in late 1800s Boston. Tesla decides that Samuel may be worthy of his attention and convinces the ex-Pinkerton detective that his approach to killing 'The Shifter' is the only way to deal with it. Houdini arrives at the office and pleads Caitlin and Granville to take on a haunting case at a theatre. Are they up to the task?