The Long Cosmos - The Long Earth Book 5
Description from the back of the book
2070-2071. Nearly six decades after Step Day and in the Long Earth the new Next post-human society continues to evolve.
Joshua Valiente, now in his late sixties, wants to make one last, solo journey into the High Meggers. Only it's an adventure that turns into a disaster. Alone and facing death, his only hope lies with a group of trolls....
Condition - Fine as new