Who Could That Be At This Hour? by Lemony Snicket

I think this book is probably aimed at a much younger audience--and while it may work for that audience, it's less entertaining for adults to read. Its young protagonist, who has deliberately apprenticed himself to the worst chaperone to give himself more freedom to follow through on his own (still somewhat mysterious) plot, realizes that the mystery he is solving is hardly the mystery he thought it was. There's lots of humor, many ridiculous adults, and a spattering of difficult words with definitions worked in, so many children will enjoy this book. I didn't find it as well done as the author's previous series, A Series of Unfortunate Events.