A Diamond In My Pocket (The Unaltered) by Lorena Angell

In the Amazon Bestseller, A Diamond in my Pocket, sixteen-year-old Calli Courtnae surprisingly breaks the 100-meter world record at a high school track meet and is whisked off to Montana to train for Olympic tryouts. Upon arriving, however, she finds something totally unexpected. Her fellow athletes are secretive, mysterious, paranoid, uncommonly beautiful—and endowed with the same gift of superhuman speed she now exhibits. The truth, Calli learns, is she has been brought to Montana to join an elite clan of Runners who train to undertake highly secret missions for the benefit of superhuman kids everywhere.

When three Runners from her compound are kidnapped by a clan of evil terrorists who can kill with their thoughts, Calli is assigned to the team that must deliver a rare magic diamond to the terrorists in exchange for the hostages. Calli is just beginning to accept her new world when it is turned upside-down by a mysterious woman who secretly gives Calli the real diamond, while the team leader is given a decoy. Almost immediately the magic diamond in Calli’s pocket unleashes within her a startling range of supernatural powers and mind-reading abilities. Using her new-found powers, Calli exposes traitors among her team, has visions of her companions’ tragic futures, and learns she alone holds the power to change the outcome. While Calli knows her powers derive from the secret diamond in her pocket, her companions do not, and Calli dreads the fast-approaching day when they will discover the truth.