When a mysterious illness attacks nearly all of the members of her commando-like, undercover medical team, Calista St. James must once again rely on her sometime lover Damian DeLuna for help. Never sure if she can trust what he's saying, she must nevertheless head to South America with him to find the cure for what's ailing her friends. Olivia Gates' Radical Cure (4) is jam-packed with excitement. Calista is an intriguing, layered character. The amount of research put into the story is apparent in its rich detail and in the author's knowledge of medical terminology.