The Sense of an Ending is the kind of novel you might need to ponder for a few days before coming to any conclusions.
This is partly because its author, Julian Barnes, leaves a key mystery swirling in ambiguity, and partly because of its uncomfortable theme of the unreliability of our memories as a record of our own histories.
The novel, which won the Man Booker Prize a week ago, is narrated by Tony Webster, a retired Londoner whose recollection of formative events of his youth is slowly unravelled after an unexpected bequest.
Tony hasn't seen his university girlfriend, Veronica, in more than 40 years, so he is surprised to receive a lawyer's letter informing him that her mother has left him £500 and a diary in her will. He recalls that he met her mother just once, in an uncomfortable weekend spent at their family home.
The diary belongs to Adrian, a formidably intelligent school friend who dated Veronica after she and Tony split, and who committed suicide shortly afterwards, at the age of 22.
At the time, Tony accepted Adrian's death as an act of philosophy: "life is a gift bestowed without anyone asking for it; the thinking person has a philosophical duty to examine both the nature of life and the conditions it comes with; if this person decides to renounce the gift no one asks for, it is a moral and human duty to act on the consequences of that decision".