Nine-year-old Emily Anne Toussaint is shot dead on a Montreal street. A North Carolina teenager disappears from her home and parts of what may be her skeleton are found hundreds of miles away. For Dr. Temperance Brennan, a forensic anthropologist in both Montreal and North Carolina, the deaths kindle deep emotions that propel her on a harrowing journey into the world of outlaw motorcycle gangs.

As a scientist, Tempe should remain dispassionate. As a caring individual, she yearns to take the killers off the streets. Emily Anne was cut down in a biker crossfire. The North Carolina victim, Savannah Osprey, was last seen hitching a ride with a transient bi...