The Monogram Murders (2014) is a mystery novel by British writer Sophie Hannah, based on characters created by Agatha Christie. Poirot is taking a holiday from private-detective work, though in fact he has only travelled to the guest house nearest his London flat; he can even see the flat from the house's parlour window. One evening, while waiting for his dinner in a coffee house he frequents, he is confronted by a distressed young woman who tells him that she is "already dead... or will be soon", but that he absolutely must not pursue her killer. "The crime must never be solved", she pleads. The next day brings news that three seemingly unconnected people have been murdered in their rooms at the Bloxham Hotel, each with a cuff-link placed carefully in their mouths, and engraved with the initials "PIJ". Furthermore, the staff are alerted to the murders and room numbers by a note left at the front desk, reading "MAY THEY NEVER REST IN PEACE. 121. 238. 317." Poirot, enlisted by investigating Scotland Yard officer Edward Catchpool, whom he meets staying at the same guest house, takes the case, and gradually uncovers a complex web of bigotry, hate, and vengeance.
Đây là nguyên bản của bản dịch tiếng Việt "Kỳ án dòng chữ tắt". Cuốn này cũng có nhân vật Hercule Poirot. Do Sophie Hannah mua bản quyền với đại diện của Agatha Christie nên được để tên bà trên bìa và sử dụng tên Poirot trong tác phẩm của mình.
