Rogue Moon - Algis Budrys

The moon had finally been reached, and on it was found the most terrifying structure, that killed men over and over again, in torturous, unfathomable ways. Clearly, only a mad man or a suicidal maniac could explore its horrible secrets.

All his life, Al Barker has toyed with death. So when the US lunar programme needs a volunteer to penetrate a murderous labyrinth, alien to all human comprehension, Barker's the man to do it. But what is required of Barker is that he withstand the trauma of dying, not just once, but time and time and time again ...