Former architect Frank Kittridge is serving a life sentence for the murder of a drug dealer who sold drugs to his son. So when he is offered a deal by a private space company that owns a prison, he accepts. He has been chosen to help build the first permanent base on Mars. Unfortunately, his comrades are just as guilty of their crimes as he is, and he will have to learn to trust them if they are to succeed. As the prisoners work on the desolate and frozen Mars, accidents multiply. Until Frank begins to suspect that these are not accidents. There is a killer among them, and they are all suspects...