Books in the The Ava Lee Novels series

"Ava is in Shanghai with Pang Fai to visit her ailing friend Xu when a triad war breaks out in Hong Kong. Sammy Wing, an old enemy of Ava's who has twice tried to kill her, has enlisted the aid of his nephew Carter--the new Mountain Master of Sha Tin--to reclaim control of his old territory, Wanchai, from Xu's men"--Publisher description.