A new generation is growing up on the island paradise of Camelot, ignorant of the Great Grendel Wars fought when their parents and grandparents first arrived on Earth. Setting out to explore the mainland, this group of young rebels feels ready to fight any grendels that get in their way. On Avalon, however, there are monsters that dwarf the ones their parents fought, and as the group will soon learn, monsters also dwell in the human heart. Avalon does not give up her secrets easily, and some of those mysteries are wicked as sin and blacker than the grave.

After more than two hundred years as a corpsicle, Jaybee Corbell awoke in someone else’s body and under threat of instant annihilation if he made a wrong move while they were training him for a one-way mission to the stars. But Corbell bided his time and made his own move. Once he was outbound, where the society that ruled Earth could not reach him, he headed his starship toward the galactic core.

Avalon was thriving. The cold sleep colonists from Earth had settled on a verdant, livable world. The fast and cunning predators humans named “grendels” were under control, and the mainland outposts well established. Avalon’s new mainland hydroelectric power station was nearly complete, and when on-line would compensate for the nuclear power systems lost in the Grendel Wars. Humans would have power, and with power came the ability to make all the necessities for life. They would survive. They would not survive as a spacefaring people.

The oldest children of the settlers on Avalon are now in their late teens and want independence from their parents and guardians. And they especially don’t want them around for the initiation ceremony held on Black Ship Island for the younger children just reaching their teens. But when previously unknown creatures make their deadly appearance, things go horribly wrong.

Tiffany Aching, the young witch from The Wee Free Men, A Hat Full of Sky, and Wintersmith is back in a new adventure featuring Discworld characters both familiar to fans (such as Tiffany, the Wee Free Men, Granny Weatherwax and Nanny Ogg) and new (meet Wee Mad Arthur, the Nac Mac Feegle on the City Watch whose only previous appearance was a brief cameo in Feet of Clay, and city witch Mrs Proust - a fabulous Pratchett creation).