Forbidden Duke by Victoria Pinder

Donna Smith has always dreamed of seeing how the other half lives. When she finds herself out of a job, she uses her downtime to finally get out and see the world, and her first destination is to witness a royal wedding in Avce. With the first item checked off her bucket list, she sets out to check off the remaining items one by one…as soon as she can figure out how to sneak into the reception undetected and find a handsome stranger to lock lips with.

Blackwell Oberlin, the Duke of Oakley Woods, promised his father he’d one day marry, but on one condition: she has to be someone unlike anyone he’s ever met. When on a whim he plants a kiss on a beautiful stranger, he thinks he’s met the one, but before he knows what’s happened, she’s nowhere to be found and he can’t stop thinking about her. Using his money and influence, he hires a security team and a girl with a sophisticated algorithm to find her.

But when he does, will it lead to a happily-ever-after?