Lewis Barnavelt is back and this time he has stumbled upon something more powerful than even his imagination can dream up. A camping trip with his Scout troop leads Lewis straight to an old grave and a mysterious, magical whistle. When Lewis discovers that this whistle has the power to stop the boys who insist upon bullying him, he is left with a tough decision. Does he continue to use the whistle, which he suspects might not be completely safe? Is Lewis strong enough to face the potent spirit that he is unknowingly summoning?

Something evil has taken over. Lewis Barnavelt and his uncle are in England, visiting a cousin at Barnavelt Manor. Lewis quickly becomes friends with the housekeeper's son, and as the two boys explore a garden maze, Lewis accidentally unleashes demonic forces that summon the ghost of an evil wizard bent on destroying his entire family. Can Lewis fight the maniacal wizard, or will all the Barnavelts perish?

Lewis is sure that Grandpa Barnavelt's 1859 lucky coin is really a magic talisman in disguise. With its power, he could do anything he wanted - like get back at bully Woody Mingo. But as soon as he begins wearing the coin around his neck, strange things start to happen. Mysterious letters arrive in the dead of night. A strange, shadowy figure seems to be tracking him. And when Lewis finally gets his revenge on Woody, he feels as if someone else is inside his body, urging him to go even further. Has Lewis awakened a force beyond his control?

It was a warm summer day in 1951 when Rose Pottinger and Mrs. Zimmermann entered the tunnel. When they had emerged, it was snowing...and the year was 1828. Mrs. Zimmermann had felt that the ghost of Granny Wetherbee, who had taught Mrs. Zimmermann witchery, was in trouble and needed help. So she and Rose Rita had traveled to Pennsylvania where Granny had lived. They never dreamed that they would also journey back to a time long ago where they would encounter a sorcerer more terrifying than either could have imagined.

After Rose Rita Pottinger cuts her finger on an enchanted Egyptian scroll, Lewis Barnavelt must work together with his neighbor Florence and sorcerous uncle Jonathan to rescue Rose Rita from the tomb in which she's imprisoned.