The couple embarked on a cross country trip in their converted van to experience the beauty of the national parks. They documented their trip, posted on Instagram, YouTube, they were in the process of starting their blog. But only one came back. How is that possible? Where did Gabby go? Why did Brian- her fiance - come back with the van without her? And now with Gabby's body found and Brian is now missing - the ongoing investigation is only getting muddier. If you have any tips or information please reach out to the FBI tip line at 1-800-CALLFBI (225-5324).