If the ticket is free, it means you're the attraction London, 1977. Year of the Silver Jubilee, the Sex Pistols-and a spate of unexplained disappearances from across the academic world. Elizabeth Belfort, a young agent with a high-flying career and a low-flying marriage, is urgently dispatched to bring in an elusive government informant. But she soon finds herself drawn into the mysterious world of this informant and his family as they embark on a rescue mission. New horizons and new loves start to overturn her well-ordered life. Before long, she is travelling across galaxies to confront an alien race, who've taken a special interest in planet Earth and its primary intelligent species. They've even made a special home for some of them. In a zoo.