Airlock Divided. The Ghost Experiments and the Sentient Core (en Inglés) - A D Kessler

In a station where rank is determined by the "Sorting," breathing is a privilege, not a right.

Luma is just another cog in the industrial machine of Agri-6, a world defined by recycled air and cold, uncompromising metal. For years, she has survived by counting her steps and obeying the station's rigid protocols, all while hiding the secret glowing on her wrist: a biometric "sun-mark" from an experiment the authorities claim never happened.

But the station is waking up.

A forbidden melody - a binary lullaby from Luma's past - is echoing through the pipes, and a terrifying biological rot is spreading through the vents. It mimics human handwriting, digests memories, and turns the very air into a weapon. As people vanish from the shift logs without a trace, Luma realises the sentient Core no longer wants code - it wants the truth.

To save the inhabitants of Agri-6, Luma must reunite with Arlen, the "primary pair" she was forced to leave behind. Together, they must navigate the shifting, organic geometry of the Kingdom of Dust and face a judge that sees straight into their souls.

The air is shared. The hunger is mutual. Will you open the door?