After a string of stressful missions, agents Dragomir Popescu and Benjamin Hammer attend a party to unwind and let loose. But, L'essaim is no ordinary shindig - one night every Autumn, vampires from all around the world gather in Gaule to forget their troubles in a big swarm. After being away on missions for so long, Dragomir has grown unused to being amongst his people and troubling memories follow him here. Content to spend the entire night at the bar, Dragomir is convinced that finding someone to talk to, let alone dance with, is a pipe dream... That is until he shares a few drinks with another lonely soul.