Robert A. Heinlein

He was betrayed by a friend and the woman he loved. His brilliant inventions were stolen through deceit. Thirty years later, he awoke from hypersleep. Both hatred and love were left in the distant past. But sometimes, those who never give up manage to find a 'door into summer.' Even if it means returning to their own past...

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Juan "Johnny" Rico, a high school student living in Buenos Aires, joins the Federation military in the hope of following his love, Carmen, into space. He has to undergo harsh training to become a soldier, harsher than he expected, but despite several setbacks and traumatic experiences, Johnny perseveres and finishes his training. However, a war is brewing on the outer planets with a strange alien enemy and Johnny is thrust into the conflict.

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In the future (1970) the US sends a mission to the moon to investigate the building of a moon base.

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A team composed of an aerospace scientist, an ex-Air Force general, and an industrialist conceives an ambitious plan to land Americans on the moon. From their base in the Mojave Desert, they construct and successfully launch a spacecraft named "Luna" that contains a cargo of four astronauts. But a critical miscalculation of needed power to escape the moon's gravitational pull may put the astronauts' lives in danger.

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