The Monster in the Box (Inspector Wexford #22) by Ruth Rendell

'Wexford had never told anyone. The strange relationship, if it could be called that, had gone on for years, decades, and he had never breathed a word about it. He had kept silent because he knew no one would believe him. None of it could be proved, not the stalking, not the stares or the conspiratorial smiles, not the killings, not any of the signs Targo had made because he knew Wexford knew and could do nothing about it.'

Wexford had almost made up his mind that he would never again set eyes on Eric Targo's short, muscular figure. And yet there he was, back in Kingsmarkham, still with that cocky, strutting walk.

Years earlier, when Wexford was a young police officer, two women were found strangled. No one was convicted but every personal and professional instinct told Wexford that the killer was Eric Targo. A psychopath who would kill again ...

As the Chief Inspector investigates a new case, Ruth Rendell looks back to the beginning of Wexford's career, even to his courtship of the woman who would become his wife. The past is a haunted place, with clues and passions that leave an indelible imprint on the here and now.