The act of love

No man has ever loved a woman and not imagined her in the arms of someone else. Felix Quinn calls himself a happy man. He owns one of London's oldest antiquarian bookshops. He is married to and adores the beautiful Marisa. But a childhood experience has taught him that loss is intrinsic to love, and Felix realises that he can only be truly happy if his wife is sleeping with another man. Enter Marius into Marisa's affections. And now Felix must ask himself, is he really happy? By the winner of the 2010 Man Booker Prize.