His first three books , The Underdog , Fighting Ruben Wolfe , and When Dogs Cry , released between 1999 and 2001 , were all published internationally .
Zusak is the author of six books .
Zusak 's first three books , The Underdog , Fighting Ruben Wolfe , and When Dogs Cry , released between 1999 and 2001 , were all published internationally .
Zusak is the author of six books .