Alan Farragut has gone missing and after 15 years, Julia has found him. Sarah, who has been working for Ilaria, could be the last key he needs to rid the world of immortals. Also, at Ilaria, there has been an outbreak of a mysterious illness that kills while it doesn't. Will Alan convince Sarah to help him? Will Julia and Sarah convince Alan to help them? Is this finally the end of Ilaria? This book picks up where the SyFy series Helix left off when it was cancelled after season 2.