Baldacci, David. The Collectors (New York: Warner Books, 2006) 438 p.

In this sequel Jonathan DeHaven, Director of the Library of Congress Rare Book Room is found dead in a climate controlled vault. We get to know Caleb Shaw a little better.

He smoothed down his rumpled gray hair and loosened his belt a bit. Caleb had a slightly built frame, but as of late he'd experienced an uncomfortable weight gain around his waist. He hoped that riding his bike to work would adequately address this problem. He avoided anything approaching a sensible diet, immensely enjoying his wine and rich food. Caleb was also proud of the fact that he'd never seen the inside of a gym after his graduation from high school. (p. 34).

After finding DeHaven's body Shaw works with the Camel Club to find out what is going on.