Radio signals have been picked up that might reveal the location of Downstream. Macia longs to find her mother there and tries to persuade her friends Gax and Cecilia to join her in the search. But is it a dangerous mistake or a mission from God? Many difficulties await them and they will need to trust God as they encounter darkness and danger, reaching out with the Light. The book follows on from Walled City and Beyond the Hills but can be read as a standalone.