CALCULATED REVENGE (3) by Jill Elizabeth Nelson: The horror of teacher Laney Thompson's 8-year-old sister, Gracie, going missing 18 years ago is reawakened when she discovers Gracie's dirty backpack. Fearing for the safety of her own 8-year-old daughter, Briana, Laney turns to principal Noah Ryder. As Noah gets drawn into the search for Gracie's abductor, will he overcome a tragedy from his past to solve an 18-year-old mystery and protect the mother-daughter duo he's come to love? Nelson's tense, absorbing mystery has interesting characters. But some incidents need clarification, and the heroine acts in a dangerously impulsive manner.