Ghost Club

The Ghost Club is a paranormal investigation and research organization, founded in London in 1862.

In 1868, Ghost Club member Charles Dickens invited Jacob and Evie Frye to join the Ghost Club, and help debunk several mysteries across the city, which apparently stemmed from paranormal causes. Among these mysteries was the supposed return of Spring-heeled Jack, an entity who was attacking women in the city's poorer districts.

Despite initially believing to have debunked the theory that Spring-heeled Jack had returned, discovering the attacks to be the work of a local cult, the Ghost Club was ultimately unable to definitively disprove the possibility of a spirit being responsible.

Reference

 * Assassin's Creed: Syndicate