Royal Intelligence Series by Dena Garson, Heather Long

Nathaniel Dennison is an investigator with the Royal Intelligence Office. Because of his knack for solving puzzles, he’s assigned a case involving a string of missing scientists. During his investigation he crosses paths with Trixie, the only woman to ever tempt him into considering marriage. Despite the bruising his heart took when she left, he can’t leave her to search for her missing brother on her own. Beatrix “Trixie” Wadeworth is desperate to find her brother... moreNathaniel Dennison is an investigator with the Royal Intelligence Office. Because of his knack for solving puzzles, he’s assigned a case involving a string of missing scientists. During his investigation he crosses paths with Trixie, the only woman to ever tempt him into considering marriage. Despite the bruising his heart took when she left, he can’t leave her to search for her missing brother on her own. Beatrix “Trixie” Wadeworth is desperate to find her brother. So desperate that she breaks into the Royal Intelligence Office in London. Getting caught is inconvenient. But getting caught by the one man she never stopped loving may actually be fortuitous. It feels like a lifetime since she last saw Nathaniel but it only takes seconds for those feelings to come rushing back. Danger follows Nathaniel and Trixie from London to Edinburgh and back as they search for clues. In the end they find there is more than one mystery to solve. How they ever lived without each other may be the greatest of them all. less

Phoebe Ashdown cannot believe her luck. Only she could run into the cad who jilted one of her closest friends while attending a Christmas ball in a foreign country. Other than his false identity and the trail of broken hearts he scattered across London ballrooms, he is just the sort of gentleman she should marry. She wants to hold on to her loathing of him but there’s something dangerously appealing about him now and it’s not just the alias he uses... morePhoebe Ashdown cannot believe her luck. Only she could run into the cad who jilted one of her closest friends while attending a Christmas ball in a foreign country. Other than his false identity and the trail of broken hearts he scattered across London ballrooms, he is just the sort of gentleman she should marry. She wants to hold on to her loathing of him but there’s something dangerously appealing about him now and it’s not just the alias he uses. The gentle folks of Genoa have been forced to turn a blind eye to the illegal activities going on beneath their noses for years. But as an undercover investigator for the Royal Intelligence Office, Vernon Wright cannot. His orders are clear: find the source of the slaves being funneled into London and report back. When he unexpectedly crosses paths with a former acquaintance, a woman he was secretly attracted to since her coming out, he must use all his powers of persuasion to keep her from blowing his cover. After Phoebe’s sister goes missing, she is forced to turn to Vernon for help. Sparks fly as well as bullets as they search for her sister. They will have to rely on each other if they hope to make it back to England in time for Christmas. less