Welcome aboard the Space Vessel Vancouver. Its mission: to guard a vast shipment of grain from Earth to the planet Safenesthome. Its Captain is called Ace. She seems a little unsure of herself. In fact, some might almost think she was new to the job... Its medical officer is called simply "the Doctor", and he's perhaps not all he seems. When mysterious ships target the Vancouver, Ace and the Doctor are pushed to the limit. Meanwhile, there's something nasty in the grain containers. And it's not very happy....