The shooting of successful paediatric dentist Kendra Hatcher in the gated parking garage of her Dallas condo spurs detectives to unravel a twisted plot as they chase a fugitive who ends up on the FBI's most-wanted list.

Holistic doctor Teresa Sievers looks forward to a television career on the horizon until someone bludgeons her to death in her Florida home; a random tip from an out-of-state police chief ultimately brings investigators face-to-face with the killer.

The key to solving the toughest murders lies somewhere in the final 24 hours of a victim's life. Determined investigators must piece together events to reconstruct the timeline, unlock the motive, and ultimately close in on the killer.

With two mortal gunshot wounds and tape residue on his wrists and ankles, it's clear 21-year-old Landy Martinez suffered before his death; detectives hope the victim's cell phone provides the critical evidence they need to close in on his killer.

In Connecticut, a motorway clean-up crew discovers a suitcase containing the crumpled remains of 24-year-old Valerie Reyes; as the list of potential suspects grows, solving the case may hinge on a portrait of the killer sketched by the victim.