"The Avenger" by E. Phillips Oppenheim is a detective novel written during the early 20th century. The story revolves around Herbert Wrayson, who becomes embroiled in the mysterious murder of his neighbor, Morris Barnes, and the enigmatic woman who visited him on the night of the crime. The novel explores themes of identity, moral choices, and the quest for truth amidst confusion and suspicion. At the start of the novel, we are introduced to Herbert Wrayson, who encounters a beautiful woman in his flat who mistakenly believes she is in the apartment of Morris Barnes. An unusual tension exists between them, culminating with a phone call that informs Wrayson of an urgent matter concerning Barnes. Shortly after, Wrayson discovers that Barnes is dead, leading him to connect the dots between the mysterious woman, the murder, and his own inexplicable involvement. This captivating opening sets the stage for a thrilling narrative of intrigue and suspense, compelling the reader to uncover the truth behind the events that unfolded. (This is an automatically generated summary.)