Clues but No Answers in One of Syria War's Biggest MysteriesClues but No Answers in One of Syria War's Biggest Mysteries

DOUMA, Syria — Razan Zaitouneh earned enemies on all sides of her homeland's civil war.

One of Syria's most well-known rights activists, she was bold, outspoken and defiantly secular. Perhaps most dangerously, she was impartial. She chanted in protests against President Bashar Assad, but was also unflinching in documenting abuses by rebels fighting to oust him.

Then she vanished.

Her fate has been one of the longest-running mysteries of Syria's long conflict. There has been no sign of life, no proof of death since a cold December evening in 2013 when Zaitouneh, her husband and two colleagues were abducted by gunmen from her office in Douma, a rebel-held town on the outskirts of Damascus.