Dead Man's Wharf by Pauline Rowson

The new Detective Inspector Horton mystery - Horton and Cantelli are called to a nursing home where an elderly resident claims shes been attacked by an intruder. Ready to dismiss it as senile ramblings, Horton then discovers that her room-mate has died, the dead womans belongings are missing and her son, convicted for armed robbery, has been found dead in his cell. Soon Horton finds he is caught up in a complex investigation that has far-reaching international implications.