"What kind of books does your brother read?" Reid asks, without looking up from his perusal of titles. He's tempted several times by volumes with publication dates well after his own time, but he can't help think of paradoxes, stable time loops, and the dozens of other possible consequences for messing with time.

He's still tempted, of course, and Nix might notice his hand hesitating by a book or two before moving on.

It'd be better if he didn't even open one.