I.S.S. stands for International Space Station which makes a very claustrophobic setting for this "thriller".
As the film starts, two American astronauts arrive at the station to be greeted by their American colleague and three Russian cosmonauts. These six characters are the only people in the film and for the first day or so, they live and work in friendship and perfect harmony.
The film stars Ariana DeBose, Chris Messina, and John Gallagher as the Americans. Masha Mashkova, Costa Ronin, and Pilou Asbaek as the Russians.
Very quickly things take a turn for the worse when they notice explosions of some sort back on earth. Each group then receives transmissions from their respective governments that war has broken out between Russia and the United States and they are to take control of the station at all costs.
It is an extremely intriguing premise that sets the stage for some suspenseful moments as friends and allies are now enemies and unsure just how far to take their orders. For a while the premise holds up, heighted by a suspenseful score but with only six people in a very tight space there can only be so much tension. There are a couple of twists to keep things off balance but eventually interest wanes.
Definitely a movie you can wait to stream...or not.