Order [book in series=yearoffirstbook.book# (eg 2014.01), stand-alone or one-author collection=3333.pubyear, multi-author anthology=5555.pubyear, SFM/MM=5000, interview=1111]: 1973.01

The House with a Clock in Its Walls by John Bellairs

Lewis Barnavelt is a chubby middle schooler whose parents recently died in a car accident. He has just arrived in a new town at the house (mansion, actually) of an uncle he hardly knows. Uncle Jonathan is eccentric, as is his neighbor and best friend, Mrs. Zimmerman, a middle-aged widow who loves the color purple.

As Lewis begins to adjust to a new living situation, new school, and new neighborhood kids, he gradually becomes aware that there’s something weird about Uncle Jonathan and his house.