When FBI agent Ava James received a call from an ex, she could have never predicted the mayhem that would follow... After receiving an invitation to attend a Christmas themed wedding in the mountains, Ava had planned out her perfect winter escape. However, the getaway turns into a nightmare when she stumbles upon the groom’s sister frozen in the snow. Jumping into action, Ava calls the local sheriff and begins to investigate the scene. With no apparent signs of foul play and many guests to interview, the investigation seems to have hit a dead end. Until screams ring throughout the Chalet and bodies begin to drop. Now, it’s certain that a murderer is on the loose, and Ava soon finds allies and enemies in many unexpected places. This is the invitation to the most festive and shockingly murderous wedding of the year. Amidst the glittering snow and holiday cheer, one grim certainty lingers - there’s a bloodthirsty killer or killers among the twenty guests.