'If you were to ask me to tell you about my wife, I would have to warn you at the outset that I don't know a great deal about her. Or at least, not as much as I thought I did...' So speaks Alex, the narrator of this unforgettable literary thriller. Alex is in his thirties, a solitary man who has finally found love in the form of his beautiful and vivacious wife, Rachel. When Rachel is brutally murdered one midsummer night by the lake in the grounds of their alma mater, Worcester College, Oxford, Alex's life as he knew it vanishes. He returns to Oxford that winter, and through the shroud of his shock and grief, begins to try to piece together the mystery surrounding his wife's death. Playing host to Alex's winter visit is Harry, Rachel's former tutor and trusted mentor, who turns out to have been involved in some way in almost every significant development of their relationship throughout their undergraduate years.