The movie is loosely based on the fifth book of 'Hasamba' series written by the Israeli Author Yigal Mossinson.
Except the characters' names, the movie plot has little to do with the book.
The Hasamba and Black Hanky members are portrayed in the movie significantly older than they are in the book.
In the book, there is additional member in the Black Hanky gang - Joseph 'Shorty' Abrahamy.