An early morning in October, 15 people are taken hostage from a subway train. This puts a huge hostage crisis in motion, and it changes Denmark forever.

Heartless follows Sofie and Sebastian - two siblings with a deep dark and fatal secret. In order to survive they must suck energy out of other people. We follow their quest for answers as to why they are this way and their search leads them to Ottmannsgaard, a boarding school with plenty of deep dark secrets of its own.