The Hand of the Necromancer — John Bellairs

In a Massachusetts town, an evil wizard is about to come back from the dead and a young hero must fight to stop him . . .
 
In the days of the Salem witch trials, the sleepy hamlet of Duston Heights had just one practitioner of the dark arts: the notorious necromancer Esdrias Blackleach. As the fever for witch hunting reached its terrible peak, Blackleach was accused of using powerful black magic against his fellow townsfolk. But just before he could be brought to trial, he dropped dead, escaping justice forever. Or so it seemed . . .
 
Fast forward to the 1950s, the inquisitive young sleuth Johnny Dixon and his mentor Professor Childermass are getting ready to donate a box of Blackleach artifacts to the local museum when a descendant of the sorcerer shows up and attempts to steal his ancestor’s wooden hand. He has a fiendish plan to raise the old necromancer from the dead, and only Johnny and the professor can stop him and make the town safe from black magic forever.
 
The Johnny Dixon stories, from the award-winning author of The House with a Clock in Its Walls, have been acclaimed for their “believable and likable characters” (The New York Times) and “spine-tingling” supernatural adventure (Publishers Weekly).