Después de la muerte de sus padres, Lewis debe irse a vivir a la mansión de su excéntrico tío Jonathan. Pronto descubre que su tío y su vecina, la señora Zimmermann, no solo son un poco extraños, sino que ambos son magos.

Pero qué es ese inquietante tic-tac que resuena en la casa? Qué peligros se esconden dentro de las paredes de la mansión?

When Lewis Barnavelt, an orphan. comes to stay with his uncle Jonathan, he expects to meet an ordinary person. But he is wrong. Uncle Jonathan and his next-door neighbor, Mrs. Zimmermann, are both magicians! Lewis is thrilled. At first, watchng magic is enough. Then Lewis experiments with magic himself and unknowingly resurrects the former owner of the house: a woman named Serenna Izard. It seems that Serenna and her husband built a timepiece into the walls--a clock that could obliterate humankind. And only the Barnavelts can stop it!