Tim, Harry and Ella have been sent on a mission " destroy a factory, send a message. Only when chunks of ice are falling from the sky, it doesnt seem there's that much left to say. Henry Roberts returns to the BoxedIn stage with a riveting look at eco-terrorism and our relationship with the environment. Some of us argue vehemently for more sustainability " but once the sea levels rise and rivers are choked with rubbish, will that be enough? Swallows delivers an important message of caution, and (perhaps more importantly) a vital message of hope.