Let'em Breathe Space (version 2)

Twenty souls. Five months. One air supply being slowly murdered. When the crew of a deep-space mission discovers their life support is being sabotaged, suspicion becomes more lethal than the sabotage itself. With each passing day, their oxygen thins and their trust erodes, because whoever is killing them is right here, among them, breathing the same dying air. Lester del Rey crafts a claustrophobic thriller where the enemy isn't some alien threat or cosmic disaster, but the human capacity for paranoia when survival is at stake. The closed-world tension is relentless: every handshake could be a lie, every kindness a cover. Why would someone destroy a mission they'd die on too? The answer sits at the heart of this cold-war era classic, a propulsive mystery that proves the most terrifying void isn't the vacuum of space, it's not knowing who stands beside you.