Badlands Series by Seleste deLaney

After a brutal Civil War, America is a land divided. As commander of her nation's border guards, Ever is a warrior sworn to protect her country and her queen. When an airship attacks and kills the monarch, Ever must infiltrate enemy territory to bring home the heir to the throne, and the dirigible Dark Hawk is her fastest way to the Union. Captain Spencer Pierce just wants to pay off the debt he owes on the Dark Hawk and make a life for himself trading across the border... moreAfter a brutal Civil War, America is a land divided. As commander of her nation's border guards, Ever is a warrior sworn to protect her country and her queen. When an airship attacks and kills the monarch, Ever must infiltrate enemy territory to bring home the heir to the throne, and the dirigible Dark Hawk is her fastest way to the Union. Captain Spencer Pierce just wants to pay off the debt he owes on the Dark Hawk and make a life for himself trading across the border. When the queen's assassination puts the shipping routes at risk, he finds himself Ever's reluctant ally. As they fly into danger, Ever and Spencer must battle not only the enemy but also their growing attraction. She refuses to place her heart before duty, and he has always put the needs of his ship and crew above his own desires. Once the princess is rescued, perhaps they can find love in the Badlands--if death doesn't find them first... less

Inventor Henrietta Mason is retiring from airships and adventuring to return home to Philadelphia. Determined to erase all trails leading to her late father's duplicity, she dismantles his lab and removes all records of the Badlands gold. While in the city, she can't resist the lure of a charity gala but winds up regretting the whole experience. Well, everything except a heart-racing dance with a certain U.S. Marshal... moreInventor Henrietta Mason is retiring from airships and adventuring to return home to Philadelphia. Determined to erase all trails leading to her late father's duplicity, she dismantles his lab and removes all records of the Badlands gold. While in the city, she can't resist the lure of a charity gala but winds up regretting the whole experience. Well, everything except a heart-racing dance with a certain U.S. Marshal. His career and vengeance on the line, Carson Alexander must prove a connection between Senator Mason and the mafia. He lucked out happening across Mason's strikingly beautiful daughter, only to have her slip through his fingers. On a desperate hunt to track her down, he never expects his search to take him into the brutal Badlands. With a mechanically enhanced enforcer after them, only Carson knows the extent of the danger they face. He'll have to win over Henrietta's trust, and her heart, before it's too late... Sequel to Badlands. 64,000 words less