"The House with a Clock in Its Walls" is a children's fantasy novel written by John Bellairs and illustrated by Edward Gorey. The story follows a young boy named Lewis Barnavelt who moves in with his eccentric uncle, Jonathan Barnavelt, in a mysterious old house. The house is filled with magical secrets, including a hidden clock that ticks ominously, counting down to an unknown event. As Lewis learns about magic and the supernatural, he discovers that the clock is linked to a dark past involving a wicked sorcerer. With the help of his uncle and a brave friend, Tarby, Lewis must confront the dangers that arise from the clock's power and protect his new home.