Payback, by Peter Barns

Ex con, Frank Collins, had a new life and a new love. Until the day his daughter’s suicide brings his whole world tumbling down.
Determined to find out why his daughter had done such a terrible thing, he returns to a life he thought long behind him. Desperately trying to deal with emotions that threatened his new found stability, he follows his daughter’s lonely downward journey into drugs and prostitution.
Finally discovering that a London gang had used and abused her, he has a choice to make. Will he seek justice from the courts, or evoke his own deadly payback?
His decision will turn his whole future on its head.