Dead just one week into her Australian honeymoon, Tina Watson's body lay a hundred feet below the ocean's surface at the foot of the Great Barrier Reef. Across the globe, three days into a secret Aruban getaway with an older gentleman she met online, Robyn Gardner vanished from the same Aruban town as Natalee Holloway just five years earlier.

Why did Robyn Gardner's travel companion purchase a $1.5 million insurance policy and make himself the beneficiary? Did Tina Watson's husband really insist she increase her life insurance coverage to $1 million before the wedding? When both suspects' stories are deemed suspicious, what does the evidence ultimately reveal?

Motive and opportunity gave the media full opportunity to cast these suspects as murderers. But what actually happened? And what is it about this pair of bizarre cases that remains brutally chilling to this day? FATAL SUNSE6T: VANISHED BEAUTY-Mark Yoshimoto Nemkoff