In 2009 a series of devastating gas attack rocked Europe leaving the United Kingdom a corrosive wasteland quarantined off from the international community. The few survivors were left to fend for themselves amidst an atmosphere of suspicion and deceit, struggling to maintain their grip on reality... Four young children have found themselves forced to grow up as a nuclear family. One day a stranger known only as Ryan appears on their doorstep carrying with him nothing more than a mysterious suitcase.