Pit of Darkness

When Richard Logan, the partner in a safe making firm is found unconscious on an old deserted bomb site, he finds that he has no recollection of the last three weeks. Then he discovers that the private detective, hired by his wife, has been found murdered, and a safe that his firm installed in a large country house has been cleverly opened and the contents missing. So with the help of his wife, he sets to uncover the truth.