Sherlock Holmes doesn't believe in nonsense. So he certainly doesn't believe in time travell. Erica Sinclair, Aurora Teagarden and Spencer Hastings do not even know that Sherlock Holmes is real. That is until they find themselves in the 19th century, where they meet Sherlock Holmes and a still alive and very confused Richard Poole.

Roe, Sally and Arthur recall a memory in which they went into a creepy, supposedly haunted house. Lu, Frank and Sebastian are convinced Roe hired them to investigate that house. Katie, a new reporter, convinces Sally to write a story on the house. And Aida recalls rumours about kids making a creepy discovery about the house in the 1980s. Guess what... they're true.