On a windy October night in 1995,

a mysterious house fire swept through the palatial home

of a doctor and his family.

Two of the family members made it out alive.

Two of the children did not.

In the debris, medical detectives discovered much more than simply how the fire started.

Michael Ferrar and Deborah Green first met in medical school in 1977.

Both were gifted students with near genius IQs.

There was an instant attraction, and they married less than a year after they met.

Over the next 16 years, the couple raised three children,

Jennifer, Timothy, and Kelly in an affluent suburb of Kansas City, Kansas.

To outsiders, their lives seemed perfect, but the marriage was showing signs of stress.

At the North Kansas City Hospital, Dr. Michael Ferrar was a successful heart

specialist who worked very long hours, often at the expense of time with his children. Deborah

quit her own medical practice when the children were born. She battled depression, weight gain,

and was rumored to have a drinking problem.

You got the impression that Deborah wasn't

the easiest person in the world to live with.

She was, I don't want to say, well, let's just leave it at that.

In an effort to rekindle their marriage,

the couple decided to go on a school trip to Peru with their son, Tim.

While sightseeing along the Amazon River, and among the Incan remains,

...