Ana (The Sparkling Dark Series Book 2) by Nathan Giraud

Growing up with an abusive father, Ana vows never to feel weak again. A competitive boxer at fifteen, she pushes herself hard. But when a searing pain in her lower back turns out to be a cancerous tumour, Ana is forced to take a break while she awaits surgery.Eager to get back to training as soon as possible to salvage her dreams of becoming a championship boxer, Ana agrees to participate in a clinical trial to test a new immune-boosting anti-cancer drug.Upon delivery, the drug renders Ana unconscious.In her unconscious state, she wakes up in a boxing arena like none she has ever seen before—and she is one of the competitors!Across the ring stands a powerful mutant girl whom she must fight. Confronted with her toughest opponent yet, it will take everything Ana has to win the most important match of her life.Ana, along with companion stories Dean and Darren, is the second prequel to The Cell Cities, available now.