Not at the same time though. Unless they communicated after death, which would make sense.

In a way they're still very much involved in the club.

..... and we're unsuccessful.

So the writer of Sherlock Holmes and the guy who played Sherlock Holmes were ghost detectives?

he also really really believed in Mediums, Psychics, Magic and fairies. to the point it ruined his friendship with Hodini.

Arthur Conan Doyle believed that the Cottingley fairies were real. https://youtu.be/ij-uXtRrR6A

To whom shall you address your call?