For four weeks in 2008, the nation was gripped by a disturbing mystery: How did little Caylee Anthony just disappear from her Florida home?
The tragic answer after 31 days of searching would trigger a murder trial that captivated the country. It also left behind many more questions than answers.
But before her acquittal, before everyone wondered if Casey Anthony would give an interview, we all focused on those first few weeks.
Watch the beginning of Vinnie's quest as he asks: What really happened to Caylee Anthony?
See Part Two: Casey's odd behavior