When an unidentified hiker turns up dead in the Florida wilderness, authorities release a sketch and a sea of strangers come forward swearing they met him on the trail. He was kind, quiet, generous with his snacks — and apparently allergic to telling anyone his real name.

What starts as a missing-person puzzle quickly turns into a portrait of amateur sleuth culture at its messiest. Two Facebook groups, thousands of armchair detectives, and one tiny strand of DNA pull the case in directions nobody saw coming. The doc is less interested in the corpse than in the people circling it: the obsessives, the gatekeepers, the women who broke the case while the loudest voices took the credit.

It is sad, it is propulsive, and it is a quietly damning look at how the internet metabolizes a stranger's death. Stick around for the ending — the resolution lands harder than you expect.