Dark Heat - series one

An unexpected visitor comes to Tai's doorstep. A young girl gives hm a key. He has no idea why she left him a key. A series of events leads him to old enemies and a shape shifting witch named Brandy that seeks help from him. A powerful demon, Drake wants the key that she gave Tai. It unlocks a powerful door to Hell. Tai won't give it up and soon has strong feelings towards Brandy and wants to protect her.
Drake and Brandy were lovers at one time. Now she is running from him. How far will Tai go to protect her and the rest of the world from the demon releam that Drake wants to unleash?