Anomalies 53 Books

Summary: Eleven-year-old Ollie Robles and his best friend Garen have grown up inside Area 53, the secret underground lab next to Area 51 where the government studies captured mythical creatures. When the boys accidentally free six anomalies, including two sprites, a wyvern, a baby manticore, a llamacorn and a golem named Henry, they must chase them down and bring them home before anyone finds out, even if it means leaving the only world they've ever known.