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Clavius Deep (the novel) -- A queer science-fiction thriller with a cosmic-horror premise. Far beneath the floor of Crater Clavius on the moon, a top-secret directorate sends young men in time machines to the past and the future on Earth. The purpose of time travel is to change history to prevent the self-destruction of the planetary civilization. Listen to the audiobook version of Chapter One: Clock. Comparable works include Tenet (2020), The Adjustment Bureau (2011)