The Lost Soul Atlas by Zana Fraillon
Loyalty is tested, and a cruel twist of fate leads to an act of ultimate betrayal in this epic story that spans a city, a decade, and the divide between life and death itself. Twig is all alone after his dad goes missing. But when he meets Flea, a cheerful pickpocket, the pair become fast friends. Together, Twig and Flea raise themselves on the crime-ridden streets, taking what they need and giving the rest to the even-poorer. Life is good, as long as they have each other. But then Twig wakes up in the Afterlife. With just a handful of vague memories, a key, a raven, and a mysterious atlas to guide him, he tries to piece together what happened, and to find his way home . . . A powerful story of hope and friendship from the award-winning author of The Bone Sparrow.