In this world of contract killers, Morgan Gaines is the best of the best. When Morgan is hired to kill six people around the world, he soon discovers all the targets are also assassins unknowingly hired to kill each other.

A nurse who is happily single the rest of the year is sick of being shamed for being alone at the holidays, so vows on December 1 to find someone to take home for Christmas.

An international incident threatens to break out a war between major European powers that only an unlikely couple of bickering lovers seems able to stop.