Supernatural: Heart of the Dragon

A Supernatural novel that reveals a previously unseen adventure for the Winchester brothers from the hit CW series! When renegade angel Castiel alerts Sam and Dean to a series of particularly brutal killings in San Franciscos Chinatown they realise the Heart of the Dragon an ancient evil of unspeakable power is back! John Winchester faced the terrifying spirit 20 years ago and the Campbell family fought it 20 years before that - can the boys succeed where their parents and grandparents failed?