Carl-Johan Emanuel Vallgren was born in Linköping, Sweden. He currently lives in Stockholm. He is an author, singer, and musician. He is the creator of 'Danny Katz', a private investigator in Stockholm, Sweden.
Titles and year of publication:
|1) The Boy in the Shadows||2015 (Sweden 2013)|
|2) The Tunnel||2016 (Sweden 2015)|