MK, Promise Not To Tell, Jennifer McMahon, fiction, 250 pages. By KirkMazzi Sep 10, 2012 Pages 31-47 The book went into further detail on Kate's family, and also on Del, the "Potato Girl". All of the kids at their school performed a fake "wedding" for Del and a mute boy named Mike. FICTION: Mystery--31-47 pages; total (47)