About the book:

Part rescue mission, part resource discovery, SIS/TR: A Rare Geometry is unlike anything your players have ever encountered.

25 rooms and thousands of ways SIS/TR can attack, infect, and hack their way through your party. SIS/TR is already a puzzle players have to solve - the ship functions as a puzzle within a puzzle as SIS/TR consumes resources, manipulates rooms, and broadcasts horror throughout the captured ship.
A clever crew can even discover SIS/TR's unique refining abilities, allowing them to craft odd items from its system.

SIS/TR: A Rare Geometry includes rules and stats for SIS/TR, SIS/TR Mothership RPG operating manual, as well as a vicious starship adventure.