The Other Side of Sorrow — Peter Corris

Corruption, murder and a missing girl: routine for Cliff Hardy - except this time it is personal.
Cliff Hardy is stunned to get a phone call from his ex-wife Cynthia. It's been over twenty years since she last shouted she never wanted to see him again... and she was never a woman to change her mind. But that surprise is nothing to the bombshell Cynthia is about to drop. Dying of cancer, she's desperate to get in touch with the daughter she gave up for adoption - and the daughter in question, she also confesses, is also Cliff's.
A shocked but sceptical Cliff agrees to search for their missing daughter. But this is never going to be a straightforward investigation ...