18 - Avenger by E. Phillips Oppenheim

Dive into the intriguing world of Herbert Wrayson, a bachelor who stumbles upon a mysterious young lady in his flat one evening, searching through his belongings. Mistaking his apartment for the one above, belonging to his neighbor Morris Barnes, she flees to correct her mistake. However, she reappears at Wraysons door later that night, terrified and weak, begging for his assistance to navigate the unlit hallway. As they step outside, they encounter a chilling scene - Morris Barnes, strangled to death in a hansom. As Wrayson learns more about the young woman, who happens to be the estranged daughter of his club acquaintance, retired Colonel Fitzmaurice, he finds himself falling in love with her. But could this woman hes so drawn to be a killer? Unravel this tangled web of mystery and love in Oppenheims classic style and brace yourself for a surprising revelation at the end.