Minecraft: The lost journal by Mur Lafferty

The brand-new official Minecraft novel is a journey into the unknown! When a young girl teams up with her friend to find the boy’s missing uncle, they must leave the safety of the Overworld behind.

Alison and Max must team up to find his missing uncle Nicholas. Using the journal his beloved uncle left as a guide, the duo hurtle headlong into a treacherous and unknown landscape called the Nether. There, they meet a strange girl named Freya and her woefully unheroic dog, Bunny Biter, who agree to help them in their quest. The group must take on dangerous new foes and unravel the cryptic journal to find Nicholas and reunite this fractured family.