Heretics by G.K. Chesterton

This book, along with the classic Orthodoxy, are the two indispensable works for understanding Chesterton. They bear periodic, regular re-reading, and I haven't read Heretics in a long time. The essay "Paganism and Mr. Lowes Dickinson" in particular is one of the best distillations of the true difference that Christianity makes.

The Reversal by Michael Connelly

Terrific legal drama featuring the lawyer Mickey Haller and also the detective, Harry Bosch, from Connelly's other series.