The Locked Train - Ben Wallis

The Martian meets The Yellow Wallpaper with a Wilson-esque companion.

Teff is the sole mechanic for a giant, clanking machine: a high-tech, six-carriage train that is the only thing keeping her alive in a desolate wasteland. For as long as she can remember, her life has been measured in closed tasks, ranging from unclogging corroded valves to scouring solar cells on a moving roof.

Her only companion is Kea, a stuffed fox with button eyes who provides a voice in the crushing silence. Together, they follow a never-ending circular route through the ruins of civilization, hiding from the threats that still lurk outside their steel walls.

But the train is showing its age. The tracks are crumbling, the motors are seizing, and the mountain of repairs is growing taller every day. When a critical failure forces Teff to stop at a long-abandoned depot, she discovers she isn't as alone as she thought.

Three strangers have managed to board. Teff locks them away in the rear two carriages, initially content that she has everything to survive - water, food, shelter. But does she need more than that?

The Strangers are persistent. The cracks in Teff's mind widen as her defences are stripped away, leaving her to question everything.