Dr Emma Watson, a brilliant research physician, has been training for the mission of a lifetime to study living organisms in space Jack McCallum, Emma's estranged husband, has shared her dream of space travel, but a medical condition has grounded him Now he must watch from the sidelines! The mission aboard the space station turns into a nightmare when a culture of single-celled organisms begins to regenerate out of control — and infects the crew with agonising and deadly results Emma struggles to contain the deadly virus, while back home Jack and NASA work against the clock to bring her home