The fugitive synths are held prisoner in Hobb's facility, as he tries to extract the secrets of creating living artificial intelligence that have been programmed into their brains. However, he discovers a vital piece of the puzzle is still missing -- and not even Leo knows where it can be found. Laura and her devastated family come to realise how much Mia means to them, and resolve to rescue her and her friends from a life of captivity. (Radio Times)