The Prince She Never Forgot (Harlequin Romance Series #4458)

A kiss at midnight… 

Ten years ago Ruby Wetherspoon shared a stolen New Year's kiss with enigmatic stranger Alex. A kiss she has never forgotten… 

Now a renowned language therapist, Ruby is stunned when her Alex—Crown Prince Alexander of Euronia to the rest of the world!—shows up to ask for her help. 

Ruby has never been far from Alex's thoughts, but duty to his country has kept him away. Now he has a chance to make both their dreams come true…