Breathless Sin by J. B. Coke

Breathless Sin was the nickname once given to Alex Taylor’s old high school flame, and the name suited her perfectly. She was "the very distillation of the sin we all most wanted to try." Now the woman - who was once his teenager lover - has stormed right back into Alex’s life, demanding that the London detective protect her grown-up daughter. This fast-paced mystery full of intrigue and danger starts out with prostitution, blackmail and murder, but then things really get out of hand! Alex finds himself struggling to protect both mother and daughter from some of London’s most sadistic criminals and learns that this case has ramifications far beyond these shores. Each new danger is more menacing than the last, and Alex’s life is increasingly on the line as new levels of threat reveal themselves.