Now I Know by Aidan Chambers
The body of a young man, crucified on a metal cross, is found dangling from a crane in a scrapyard and subsequently vanishes. Tom, an ambitious young police officer, think he's had a lucky break when he's put in charge of this bizzare murder investigation. Nik is doing research for a film about a contemporary life of Jesus. Their independent investigations ultimately bring them together in an unexpected climax.