Salvation Of A Saint by Keigo Higashino

When a man is discovered dead by poisoning in his empty home his beautiful wife, Ayane, immediately falls under suspicion. All clues point to Ayane being the logical suspect, but how could she have committed the crime when she was hundreds of miles away? As Tokyo police detective Kusanagi tries to unpick a seemingly unrelated sequence of events he finds himself falling for Ayane. When his judgement becomes dangerously clouded his assistant must call on an old friend for help; it will take a genius to unravel the most spectacular web of deceit they have ever faced...