The Firefly series of books is the closest we will ever get to living in a world where the TV series wasn't canceled after just one season. Each book feels like a new episode of the show and Life Signs is the best one so far. Inara has not been aboard Serenity for a few books now and we finally find out why. Inara is dying. She has a terminal illness, Kiehl’s Myeloma, which is an incurable form of cancer and she has little time left. Therefore, she finally decides to let the crew of Serenity in on her secret and say goodbye. Of course this is devastating news to Mal and hard for him to accept. So hard, in fact, that he is willing to risk his own life, and the lives of his crew, on an impossible mission to save her. Mal decides that the crew needs to travel to an Alliance prison planet and break out a disgraced scientist on the slim chance that he might be able to help Inara. Pure madness.