Caught in a Moment is the story of Alex Trueman, a teenager who daydreams himself unwittingly into the strange world of Intersticia. This is a world outside of ordinary time, that exists in the slender intervals between instants. From Alex's point of view the world around him freezes into immobility. At first it seems the he alone is free to wander the hushed streets with their motionless cars and people. But he is not alone. Alex soon discovers that he shares the world with others. There are a few dozen fellow daydreamers who share his fate. There is plump, bespectacled Will, pretty brunette Kelly, and the rebellious outcast Paulo. Presiding over them all is the enigmatic Ganymede, and irascible vagrant who distributes food to his dependents and sets them perverse tasks to perform in return.
Alex soon finds that he has rare skills in Intersticia. Most uniquely he can affect the motionless world of 'Statica' around them. He can open doors, help himself to food, and move objects. But this forbidden activity soon sets him on a collision course with Ganymede in which the very existence of Intersticia is put at risk.