A war between supernatural creatures and humanity is brewing, and identical twin sisters Alice and Cassie Arcane are caught in the middle, dealing with an organisation that wants to help supernatural beings and others who wish to destroy them.

Alice and Cassie finally discover the truth about their parents while making friends and enemies in equal measure. Angels and demons, super soldiers and government assassins - the Arcane sisters will have to deal with these and more to prevent the ultimate conflict threatening to destroy all life on Earth.