The Jade Butterfly by Jeffrey Round
first published 2015, paperback
A seemingly casual encounter in a downtown bar sends missing persons investigator Dan Sharp in search of a woman presumed dead in the Tiananmen Square Massacre. Twenty years after her disappearance, her brother believes that a woman he glimpsed on the Internet is his sister, now living in Toronto. The closer Dan gets to finding her, however, the less sense things make. Just when he thinks he knows what’s driving his client, an unexpected revelation forces him to choose between what he’s been told and his gut instinct, which says things are not all they seem.