Marnie and Mary Sinclair are twin sisters who were put up for adoption at the age of seven with their older sister Macy shortly after their parents died in a car crash. They were adopted by a woman named Dolly who they learned is a ninja. Dolly had plans on starting an all girls ninja training camp against government laws stating that ninja camps are not allowed in Canada. The girls grow up learning and training in the ways of the ninja and nine years later are finally allowed to go on missions alone. When the girls find out that a young agent undercover in their school is looking to expose and kill all the girls in their camp, Marnie and Mary use the skills that they have grown up with to protect and save their new found family.