Soulhome (The Weirkey Chronicles, #1)

Series: The Nine Worlds span dimensions filled with wonder and adventure, but for Theo they mean bitter tragedy. For years he resented the betrayal that killed his friends, sent him back to Earth, and made him question everything he thought he knew.

But now, after a lifetime of struggle, he's found a way back to the Nine Worlds. An old man reborn in a new body, he has a second chance to rebuild what he lost and unravel a mystery that spans dimensions.

Book 1: Though Theo arrives in the safe world of Tatian, demons are crawling from the darkness between realms and he isn't the only inter-dimensional traveler. There's no time to carefully prepare himself: he needs to find allies among the lost just to survive long enough to make use of what he knows.