The Unaltered

After breaking the 100m world record, 16-year-old Calli is whisked away to a secret facility where she's placed with other teens who possess superhuman speed. She soon finds herself in a deadly situation involving other superpowers, a magical diamond, and a centuries-old clan vying for world domination. Calli will have to rely on her quick wit and gut instinct to navigate her new world, which includes secretly carrying a power-infusing diamond, all the while steering clear of the young man who mistakenly believes she's his soul mate. 

A Diamond in My Heart, audiobook two in the Unaltered series, follows teenaged Calli Courtnae as she learns how to control her new cosmic superpowers. She's afraid she's no match for some of the other people who are showing up with different paranormal powers, including a time-rewinding teen who apparently has some romantic fantasy about her going on in his head. She faces more challenges with him as he attempts to save the day.  

The Diamond of Freedom, book three in The Unaltered series, melds together history, geology, metaphysics, science, and fantasy in this non-stop nail biter. Calli and Chris race against the clock to identify the power-neutralizing stone that prevents Calli from healing her life-threatening injuries. She must also learn how to counter its effects before she can fight against the rogue Diamond Bearer named Freedom to save the boy she loves and the world of her friends. 

Calli learns about Chris's motives and tries to understand his dilemmas. Given no choice, the two of them travel with a mysterious companion back to General Harding's facility. They make an effort to dismantle the programs that are exterminating people with powers and wiping Diamond Bearers from the face of the Earth.