Fun, fast-paced, high-octane action adventure, 21% Monster is a perfect page-turning new series for fans of Alex Rider, Percy Jackson and the MCU generation. When Darren Devlin is arrested for destroying his school with his bare hands, it's not just the police who are after him. Enter Marek Masters, 14 years old, 19% alien, and the most intelligent, most wanted "almost human" alive. Marek is here to tell Darren the truth - he is 21% monster, and together they must take down the secret organisation that created them. Darren and Marek are wanted, powerful and dangerous. And now it's payback time.