Overprotective rake. Adventurous bluestocking. Keeping her safe is driving him mad. Loving her could heal his soul. Adventurous bluestocking Lady Calliope Seaton can solve any mystery—including the disappearance of her brother. All she needs is a little help from naval officer Nathaniel Fitzgerald, the disreputable Duke of Kelford. Nathaniel is eager to assist the foxy little wallflower right into his bed. And he needs a wife and an heir to claim his vast inheritance. So they strike a deal: a marriage of convenience. Moving into Nathaniel’s decaying Mayfair mansion and taking on his three untutored sisters would challenge even the bravest new bride. But it’s not long before Calliope is fixing up his home, winning over his sisters and claiming his heart. Nathaniel will take down every thug in London to protect his daring wife. Especially when he learns there may be a baby on the way—and a threatening stranger sends knife-wielding attackers. Feeling caged, will Calliope escape her overprotective husband? Or can the towering duke move past his fear and join forces with the wife he has come to cherish?