The continuing stories of rookie Constable Morse. The young Endeavour Morse is on the case, before his signature red Jaguar, but with his deductive powers already running in high gear.

Sarah and her sister clones are left to battle the top-secret military project producing these lethal male clones. At the same time, Sarah tries to track down her missiong twin Helena and an ailing Cosima serches for the key to the synthetic sequences that may keep them all alive. How far are they willing to go, and who can they really trust?