The first urban fantasy by Guy Gavriel Kay. I'm a huge fan and this is his latest novel.
Usually, he writes historical fantasy novels set in fictional cultures. He will base them on Viking, Italian, Roman, Spanish, French etc. This time, however, it's set in modern Provence in the South of France with iPods and cell phones.
The main character is Ned, a precocious fifteen year old, who was superbly written and completely believable. He is a smart-assed, wise cracking, practical joke playing kid who wanders into an ancient story, a fight between two men, one Roman and one Celtic who died 2500 years ago.
This is brilliant fantasy. Guy Gavriel Kay is one of the best there is and you cannot miss this if you've liked anything he's done.