Rufus Sewell and Emmanuelle Béart play Paul and Jeanne Bellmer, a couple who lost their son in the 2004 tsunami.
Remaining in Thailand as aid workers, they view a video of children in the refugee communities on the Thai/ Burmese border at a fund-raising event. Jeanne becomes convinced one of the children is their son.
Hiring a local 'fixer', Thaksin Gao (Petch Osathanugrah), they set off into the jungles of Burma, stumbling unwittingly into a heart of darkness, where a feral foe destroys all intruders.
Fabrice Du Welz's Film4-funded follow-up to Calvaire proves to be an equally chilling film.