Fascinating elements of police procedure meld with escalating tension in the taut Murder By Numbers. Sandra Bullock "redefines the female detective genre" as Cassie Mayweather, a homicide investigator who puts her career in jeopardy as she closes in on the elusive perpetrators of a cleverly planned "perfect murder." But there's something too perfect about the way the forensic evidence adds up, something that ties to Cassie's secret past.