Tooth for a tooth

the long version

"When a woman's skeleton is discovered in a shallow grave DCI Andy Gilchrist is tasked with finding her murderer. But a psychic's warnings and markings on a rusted cigarette lighter found among the rotted remains take Gilchrist on a journey into his own past that brings him closer to discovering the identity of his brother's killer from a hit-and-run case some thirty-five years before. When dental records from an extracted tooth force Gilchrist to confront the unthinkable--that his brother was her killer--he keeps his fears to himself, only to be suspended on suspicion of destroying evidence"--