Survival of the Gangster Gangster

This is the first time I write a novel. Is it good or not? The main character of the story is a gangster and his younger brother who suddenly come to a world full of zombies and kill everyone. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.