The dream of sending humans to Mars is closer than ever before. In fact, many scientists think that the first person to set foot on the Red Planet is alive today. But where should the first explorers visit when they get there? Horizon has gathered the world's leading experts on Mars and asked them: where would they go, if they got the chance - and what would they need to surviv...。Psychotherapist Diane is primed to face her hour of reckoning when a blurring of professional boundaries with an unhinged patient corresponds with the release of her son from prison. Furthermore, Diane is also being stalked by an ex-patient who does not take kindly to being ignored.。