Oxford, 1974: In the cellars beneath St. Luke's College, a sealed medieval ventilation shaft is opened up to reveal human bones. Two bodies, buried thirty years apart...but is there a connection? Desperate to protect the College's reputation--and finances--the bursar, Charlie Swift, hires his old friend, private investigator Jennie Redhead, to find out the identities of the two victims. But as Jennie pieces the clues together, it becomes clear that Charlie knows rather more about the murders than he's admitted. As she uncovers a series of scandals stretching back more than sixty years, Jennie is forced to question how well she really knows her old friend Charlie Swift--and whether she can trust him.