Ghost Knight (Deadtime Stories, #4)

Calling all ghosts. . .

Cody's not expecting to find much excitement when he visits his grandparents in Shady Acres. After all, there's not much to do there unless you're a senior citizen.

But Cody's grandfather gives him an unexpected surprise--a cellular phone for each of them so they can keep in touch during the day.

The problem is, Cody's grandfather isn't the only one calling him. Cody keeps hearing other voices on the line. Strange voices. . .voices from out of this world. . .

Cody can't figure out where they're coming from. . .until he dials 555-GHOST. Unfortunately, that connects him to a real-live nightmare--right out of the Middle Ages!