The Marriage Tree — Christopher G. Moore

It's okay for Thais to believe in ghosts -- it's their birthright. But why is Vincent Calvino seeing ghosts, and why are they so angry? Calvino is haunted by a series of deaths in Rangoon and Bangkok, when he stumbles onto a new murder case -- but is it a new case, or an old one returned from the dead? A murder investigation leads Calvino inside an underworld network smuggling Rohingya out of illegal camps and detention centers. Calvino looks for the killer in the mystical Thai world of sword and marriage trees.