On Her Majesty's Secret Santa: A Christmas Romance (Mistletoe Miracles #2)
Keira Candace Clementine

When a hard drive containing the identities of every British intelligence officer falls into the wrong hands, MI6 agent Jack Sharpe is sent to hide in the American town of Mistletoe. But he’s not going alone. Joining Sharpe is his handler, the perpetually frazzled Jubilee Hall.
Sharpe and Jubilee could not be more different. While Sharpe is charming, dashing, and coldly efficient, Jubilee is exasperated, tired, and a bit of a mess. While Sharpe moves like a shark, slinking through the world until he smells blood and attacks, Jubilee can’t get a paper cut without fainting. But when fellow MI6 agent Aleksei Trevelyan bets Sharpe he can’t win Jubilee’s heart, Sharpe starts to wonder whether he and Jubilee Hall are so different after all.
From the author of Rebel Without a Claus comes yet another unforgettable sweet and wholesome Mistletoe Miracles Christmas romance that will enthral readers until the very last page.
Note: the novels in the Mistletoe Miracles series do not have to be read in any particular order.