An opening to murder

At CrimeReads, "Agatha Christie and The Art of Opening a Mystery Novel":

.... Born on this day in 1890, in Torquay, England, she enjoyed surpassing fame in her lifetime and lays a current claim to being the bestselling novelist of all-time. She was and remains the undisputed Queen of Crime. But for all we celebrate her popularity, her prolific output, and her ingenious plots, Christie is sometimes overlooked on the craft level. .... [T]o celebrate the day, we thought: why not gather up some of Christie’s greatest opening lines?

For example, from The Murder of Roger Ackroyd (1926):

“Mrs. Ferrars died on the night of the 16^th–17^th September—a Thursday. I was sent for at eight o’clock on the morning of Friday the 17^th. There was nothing to be done. She had been dead some hours.”

Other examples of Christie's openings.

Agatha Christie and The Art of Opening a Mystery Novel | CrimeReads