Dragon's Stone — Jane Toombs

A man with a dark side, in love with a woman who, with along with her own worries, barely tolerates him, are thrown together to perform the impossible task of dealing with the evil and immortal Black Dragon, their only ally a Siamese cat. A puny trio facing impossible odds. Especially when the man's dark side manifests itself and turns him into a danger to his own allies. Their other adversary, a witch, who is on the dragon's side, adds another complication to an already seemingly hopeless task. How can this man control his dark side, convince the woman to love him and seal the dragon's fate?