As June arrives in the American Midwest it ushers in the emergence of the Michigan mayfly, Hexagenia Limbata. This prolific hatch takes place at night and with it brings out the biggest trout to gorge this feast. This is truly a unique fishing experience and can offer an angler both heartbreak and the possibility of a trophy brown trout. Follow four Midwestern fly fisherman through various obstacles as they chase this hatch and hunt these large brown trout under the cover of night. "Night of the Hex" offers a rare glimpse of fishing this rarely filmed event.