At Rosslyn Chapel, Shavi and Laura encountered another Watchman. The chapel's carvings pointed to something terrible hidden there, but although Laura was open to the warnings, Shavi appeared under the control of some spell, driving him onwards. The Bone Inspector was also drawn there by what they were attempting. He tried to prevent them, but they locked him outside the chapel so they could continue. While Shavi and the Watchmen dug into a secret chamber beneath the chapel, Laura listened to the Bone Inspector's warning.

He told her Maponus was struck down by the Fomorii as he attempted to cross over to our world from T'ir n'a n'Og. Whatever the Fomorii did to him drove him mad, so that when he arrived in our world he was an uncontrollable force, slaughtering hundreds and laying waste to many villages. Only a ritual enacted by the Culture, the Bone Inspector's people, could stop him, and then he was not destroyed, only bound in the sacred spot beneath the chapel that was raised up as both a marker and a warning. If he was freed, the Bone Inspector warned, devastation would be laid on the land once more.

Before Laura could act, Maponus was freed, slaying the Watchman on the spot. Laura and Shavi escaped as the mad god stalked out across the countryside. It appeared to be yet another of their great failures.

Back at Arthur's Seat, Tom helped Church through his first steps in learning how to perceive the Blue Fire in everything. The energy guided them through a magical doorway into Otherwordly tunnels beneath the volcano where the two were separated. In a massive cavern where time and space had no meaning, Church experienced visions of the past, present, and future. Reuniting with Tom, they came across an enormous hole plunging down into the bowels of the earth-the Well of Fire-ready to be reignited by what Tom called a leap of faith. Church decided to use the locket given to him by the young Marianne; he had always believed it was a powerful symbol.