The Twentieth Song

Times are desperate. The most unlikely are killers. You never know where you'll be, where they'll attack, where you'll meet your doom.
Even in these terrifying times, people still take time to have fun at Christmastime. Unfortunately, the Unlikely do not. How do you stop them? Do you infiltrate their ranks? Do you capture and interrogate members? How? How do protect those you love? How do you defend yourself?
Sadly, "Unlikely" may apply even to those closest to you.