The Thursday Murder Club by Richard Osman

In a peaceful retirement village, four unlikely friends meet weekly in the Jigsaw Room to discuss unsolved crimes; together they call themselves The Thursday Murder Club. Elizabeth, Joyce, Ibrahim and Ron might be pushing eighty but they still have a few tricks up their sleeves.

Cujo by Stephen King

Outside a peaceful town in central Maine, a monster is waiting. Cujo is a two-hundred-pound Saint Bernard, the best friend Brett Camber has ever had. One day Cujo chases a rabbit into a bolt-hole—a cave inhabited by sick bats. What happens to Cujo, how he becomes a horrifying vortex inexorably drawing in all the people around him makes for one of the most heart-stopping novels Stephen King has written.