All Our Yesterdays — Robert B. Parker

They were the Sheridan men, ruled by passion, betrayed by love, heirs to a legacy of violence and forbidden desire. Gus, Boston's top homicide cop--he knew equally well the backroom politics of City Hall and the private passions of the very rich, a man haunted by the wanton courage and perilous obsessions he inherited from his father ... Conn, the patriarch, a lawless cop who spawned a circle of vengeance and betrayal that would span half a century... and Chris, Gus's beloved son, a Harvard lawyer and criminologist, fated to risk everything to break the chain of obsession and rage....

Three generations linked by crime and punishment--cops and heroes, fathers, sons, and lovers united at last by revelations that could bring a family to its knees....