An undercover mission has deadly consequences.

The assignment was simple: infiltrate an office Christmas party, gather evidence and take down a drug cartel. However, DEA agent Duncan O’Brien and deputy U.S. marshal Sera Morales encounter more than they were expecting when masked thieves crash their undercover operation and abduct Sera, who narrowly escapes. Can Duncan and Sera work together, despite their competitiveness and hidden attraction, to capture a merciless drug lord — before this Christmas becomes their last?