Mary Cameron, a Highland widow with a son, doesn't believe she is destined to find passion, until she meets Baron Valentin, a Nvengarian bodyguard who'd been sent to Scotland to protect a princess.

Mary hasn't seen Valentin since he departed Scotland nearly a year ago. Now he's back, sent to keep an eye on the Nvengarian ambassador to England, who might be plotting to overthrow Valentin's tiny kingdom.

Valentin hasn't changed—dangerous, handsome, mysterious—and he wants Mary.

Valentin's people believe that the person one spends the night with on the longest night of the year—the Winter Solstice—will remain in one's life forever. Valentin is willing to put this theory to the test, to discover whether he and Mary will surrender to the magic of The Longest Night …