Doctor-turned-novelist Tess Gerritsen returns to our fiction bestseller lists in the #5 spot this week with The Sinner, her highest landing yet. In her latest book, she draws upon her experience as a physician working in Hawaii with patients suffering from leprosy. Gerritsen's current mass market bestseller, The Apprentice, went from #11 to #8 this week. Ballantine reports 145,000 copies of The Sinner in print after three trips to press; The Apprentice has 900,000 copies in print. The author kicks off her national tour on September 2, criss-crossing the country with stops in Tucson, Phoenix, Las Vegas, Boulder, L.A., Dayton, Lexington, Louisville and Worcester before returning to Maine, where she will make local appearances through September 27.

With reporting by Dick Donahue