Edgar Wallace 
Angel of Terror 

The Angel of Terror aka The Destroying Angel Jack Glover of Rennet, Glover and Simpson does not believe his cousin Meredith killed Bulford. Meredith’s father was an eccentric and unless Meredith is married by the age of thirty his sister inherits everything. She is dead and Meredith, now in prison, is thirty next Monday. Meanwhile Lydia Beale is struggling to pay her dead father’s creditors. When Glover offers her money she is shocked. However, despite the strange conditions attached, it is a proposal she cannot afford to ignore. (Goodreads)