Delia Hartston

Delia Hartston is Alexander Roby's former fiancee. When Dr Bartlett spoke to Roby, Roby initially seemed to think he was talking to Delia.

Grahame Roby expressed a distrust of Delia, suggesting she was in some way involved with the Roby murders.

Her current location is unknown, but Captain George Withers has engaged a private detective to locate her.