Mark Cohen returned from his last mission a hero. He had killed the most wanted terrorist in the world. He saved his best friend's life. And he got to catch his favorite band in concert. Things couldn't be better. But this was about to change. A new and sinister evil was about to strike at the very heart of the M-Gang. Close friends would soon become mortal enemies. Long-held secrets would become known. And Mark Cohen would soon face his greatest foe ever. Robert Linus Koehl's series, "M-Gang Chronicles" tells the story of a group of children who have been chosen for a special task: to operate the world's only underage anti-terrorism assassination team. Sivan is the second story in this series, which explores such timely topics as bullying, violence, and hatred. Defying all the rules of a sequel, Sivan is the most exciting and shocking novel in the series.