Janet Evanovich has now written 18 novels in the “Stephanie Plum” series that began with One for the Money. Many of them were bestsellers, and the initial offering actually spent 75 consecutive weeks on USA Today’s list of 150 best selling books. That must be why it seemed logical to take that debut novel and turn it into a major motion picture, with Katherine Heigl in the lead role as Stephanie Plum.