While on a promotional tour for her new book with Alan, Loretta is kidnapped by an eccentric billionaire (Daniel Radcliffe), who hopes she can lead him to the treasure of the ancient lost city in his latest book. Wanting to prove that he can be a hero not only in the pages of his books, but also in real life, Alan sets out to save him. Embarking on an epic jungle adventure, this unlikely couple must now work together to survive the Lost City and find the ancient treasure before it is lost forever.