A self-published book by a writer who is attempting 'hard' science fiction which obeys the laws of physics as we understand them and skilfully blends in actual past events with fictional past events and a possible future - complete with references. I do not want to say more so as not to spoil the surprise - although I guessed what was going on before the end and so felt it ended rather suddenly with the 'reveal'. However, it is not a long book and I read it in two sittings. It certainly kept my interest all the way through with the dilemma of the men trapped on the moon with dwindling life support and how they might escape their plight. The author seems to know the function of every knob and switch on an Apollo Lunar Module!