When 18-month old Devon Manderach's body is found in a park outside Philly, police suspect the parents; but when her father calls looking for both the toddler and her mom, police quickly learn the case is more horrific and tragic than they imagined.

When Bill and Catherine Stuart are executed in their home along with their three-year-old daughter, police look to the surviving daughter Miriam for clues. Her description of the killer leads detectives deep into Philadelphia's criminal underworld.

When Ellen Robb's husband finds her murdered in their quiet suburban Philadelphia home, evidence initially points to a robbery gone wrong. But as police dig deeper into the couple's life, they learn the motive may be far more sinister.

When Helen Bernstein is found dead in the bathtub of her Chestnut Hill high-rise, she appears to have died of natural causes. But when an autopsy reveals she was strangled, detectives find themselves asking, who would want Helen dead, and why?

When 78-year-old, George Volz's family finds him hogtied and decomposing in his Philly row house, police turn to the neighborhood for help. They're sure someone from the block killed the gentle old man, but will they be able to find his killer?

The city of Philadelphia is in shock when hard-working mother Trish McDermott is gunned down on a Center City sidewalk. Detectives work around the clock to catch the killer, someone they soon discover is more dangerous than they ever could imagine.

When Asia Adams' body is discovered after a fire in her home, police are unsure if her death was an accident or arson. But when the investigation reveals the truly horrific nature of her murder, police find themselves pursuing an elusive killer.