Hennessey works for Kemp and is the only member of the CenSSA organisation who can communicate with Annie. Hennessey does not seem to have the same prejudices against supernatural creatures that the other members of the CenSSA have. He soon feels a connection towards Annie and they talk to each other a lot. He also does not mind to sit next to her friends and werewolfs Nina and George. Other CenSSA members, like Daniel, even refuse to stay near them. When Kemp tries forcefully to exorcise Annie, Hennessey stands up for her. So Kemp kills Hennessey, to use Hennesseys door to send him and Annie away.