Dark forces beyond our world threaten the childhoods of three misfit pals in a six-part German fantasy adventure based on Wolfgang Hohlbein's bestseller Der Greif. Reluctant hero Mark (Jeremias Meyer) and friends Becky (Lea Drinda) and Memo (Zoran Pingel) stumble upon an alternate realm called The Black Tower where a terrifying creature called the Gryphon holds sway over every living being. In this fantastical world, Mark unknowingly holds the key to defeating the Gryphon thanks to his family's dark history but the youngster faces enough problems navigating a path through school. When Mark's brother Thomas (Theo Trebs) disappears, the plucky trio venture into The Black Tower to face the Gryphon and a host of otherworldly allies and adversaries