greatly enjoy this 1945 mystery thriller film about a young woman and nina foch and ( julia ross ) who be out of work and have fall behind in her rent and be desperate to find work . julia read an ad in the local london newspaper look for a secretary and rush out to try and obtain this position . julia obtain the position and be hire by a mrs. hughes and ( dame may witty ) who require that she live with her employer in her home and want her to have no involvement with men friend and julia tell them she have no family and be free to devote her entire time to this job . george macready and ( ralph hughes ) be the son of mrs. hughes and have some very strange desire for play around with knife . this be a low budget film and most of the scene be close ups in order to avoid the expense of a background and cost for scenery . this strange family all live in a huge mansion off the cornwall coast of england and there be secret door and plenty of suspense .