Paula, her son Carl, and his estranged partner Emily, join family members to mark the birthday of their missing son. As Carl fights to convince Emily to come home, new information comes to light about the missing boy, the implications of which are worse than anyone could have imagined.

Now that Dan's assassin days are behind him, all he wants for Christmas is quality time with his kids. But when he learns his daughter has her own plans, he books a family trip to London—putting them all in the crosshairs of an unexpected enemy.