Thicker than Water

In the fourth book of the Felix Castor series, old ghosts from the past resurface to bring Felix more trouble than he anticipated, involving childhood memories, family traumas, and a troubled council estate. As his life takes a darker turn, Castor faces the consequences of stepping over the line, with personal and supernatural challenges mounting. The story also introduces difficult confrontations with his brother and new encounters with figures like Father Gwillam and the Anathemata, escalating the stakes for London's freelance exorcist.