Gideon's Sword by Douglas Preston and Lincoln Child (Grand Central Publishing, $26.99, 342 pages, ISBN 978-0-446-56432-8) Gideon's Sword is another thrill ride from two of my favorite authors who introduce a brand new character named Gideon Crew in this one.  The adventure starts on the first page and never lets up as Gideon fulfills his mothers dying wish to avenge his father’s murder, but that chore is only the