This book was absolutely fantastic!
This book is about a magician named Kell who has the rare ability to move between parallel Londons. There is Grey London, Red London, White London and Black London and Kells job is it to travel between those to deliver messages. Till one day something goes wrong

"In meinem Innern ahnte ich, dass ich vom Weg abgekommen war. Das Problem war nur, dass ich nicht wusste, wann und wo. Ich wusste nicht mal mehr, von welchem Weg."
?? "I guess I knew deep inside that I wasn't on my path anymore. [...] I couldn't even remember which path I was supposed to be on."