Approaching the Source continues to follow the battle of good and evil in an ongoing story on the distant and artificial world of Vhast. The people who find themselves in the formerly hidden village of Mousehole begin to find out where their enemy, the Adversaries, are based. Instead of reacting to them, they begin to learn more about them and take them on in their own strongholds. Following on from Intimations of Evil, and the next five books of...