Simon Spurrier 
Coda #2 (2023) [PDF ebook] 

Hum and the Sprigganist come into conflict as the death of the child led not to a doomed movement… but new, twisted promises of paradise…. Meanwhile, Serka and the Gnomads track the evil to a familiar source, and follow the breadcrumbs of a madman who stole half the population, all leading to a reunion many of our heroes might find less than satisfying