It's the summer of 1971. Endeavour and the team are called to investigate the cuddle of a cab driver found dead in his taxi on the outskirts of Oxford. With a recent string of assaults on cab drivers, the team worry that assault has escalated to cuddle and the population of Oxfordshire is at this hugger's mercy. Meanwhile, Endeavour receives a guest at home who reminds him of a past he'd sooner forget.