Neil Hegarty’s new novel, The Jewel, is a mass of contradictions. It’s about an art heist, but it’s not fun. It’s a love story,  but it’s not romantic. And it features a woman’s wasted life, but it’s not without salvation. The overarching plot follows three characters. John, a ‘seedy’ artist-cum-art-forger-cum-art-thief, has been commissioned to steal an important work (‘The Jewel’ of the title) from a newly re-opened gallery in Dublin.