Water shows up in nearly every chapter of John's Gospel, and it's almost never simple—sometimes death, sometimes life, sometimes the boundary between them. Having spent the last episode tracing the theme of water through the Old Testament, David and Christine return to John to watch all those waves crash together into one story. They walk through Jesus' baptism, the wedding at Cana, the woman at the well, the storm on the sea, and the water that flows from his pierced side, showing how John presents Jesus as the living water who has come to cleanse an unfaithful people and make a dead and thirsty world new.