Watch TV Series A Murder at the End of the World FX Online Free. A Murder at the End of the World is a mystery series with a new kind of detective at the helm – a Gen Z amateur sleuth and tech-savvy hacker named “Darby Hart”. Darby and eight other guests are invited by a reclusive billionaire to participate in a retreat at a remote and dazzling location. When one of the other guests is found dead, Darby must use all of her skills to prove it was murder against a tide of competing interests and before the killer takes another life.