Secret Society

A group of people who know everything about Joy and why she is gone.

Members

 * Victor Rodenmaar
 * Mr. Eric Sweet
 * Jason Winkler
 * Mrs. Daphne Andrews
 * Sergeant Roebuck
 * Nurse Delia
 * Frederick Mercer

It's implied that there are other, unnamed members. Victor mentions a "gathering" of society members in one episode. Also, the fact that the Society was able to alter Joy's photo means that there must be a member who is an expert in photographic manipulation.

Sibuna Club

 * Nina Martin
 * Fabian Rutter
 * Amber Millington
 * Patricia Williamson
 * Alfie Lewis
 * Jerome Clarke

Other

 * Rufus Zeno (former member)
 * Sarah Frobisher-Smythe