Elizabeth Black is the headmistress of a girls' school in 1830s Victorian London. She is also a well-respected author of stories written both for and about the upper-class ladies of Victorian society. But by night, she writes very different kinds of stories - the Penny Dreadfuls that are all the rage among the working-class men. Under the pseudonym Charles King, Elizabeth has written about dashing heroes fighting supernatural threats, intelligent detectives solving grisly murders, and dangerous outlaws romancing helpless women.

Lord Elliott Mayfield sees the new generation of his family moving in the same direction of bad matches and scandalous relationships as the last. In hopes to change their course, he establishes a "marriage campaign" to motivate them to improve themselves through making respectable matches. Peter, Elliott's eldest nephew, thinks the entire idea is ridiculous. A widower with two young daughters, he simply needs a governess, not a wife. Julia Hollingsworth has the credentials and the experience, but is too young and pretty for such a job. So why can't he stop thinking about her?

London, 1885. Amelie Hampton is a hopeless romantic, which makes her the perfect columnist to answer lonely heart letters in The Marriage Gazette. When Amelie plays matchmaker with two anonymous lonely hearts, she also decides to secretly observe the couple’s blind date. To her surprise, the man who appears for the rendezvous is Harold Radcliffe - a grieving widower and a member of Amelie’s book club.

When Persephone Lancaster receives a marriage proposal from the ill-tempered Duke of Kielder, she refuses - and then reconsiders. The obscene sum of money he's offering Persephone would save her family from ruin. With her characteristic optimism, she travels to the far reaches of Northumberland to wed a greatly feared stranger. Lodged deep in a thick forest infested with wild dogs, the Duke's castle is as cold and forbidding as the Duke himself, a man with terrible scars on his body and his soul.

Wyoming Territory, 1876. US Marshal John “Hawk” Hawking is one of the most respected lawmen in the West, so when a telegram arrives from the small town of Sand Creek warning him of a death threat against him, he immediately begins an investigation. Posing as a farmer, Hawk heads to Sand Creek, a town ruled by a violent and corrupt sheriff. Only one person is trying to stop him―Liesl, the sheriff’s own daughter. When Liesl meets the self-assured and attractive new farmer, John, she hopes he might help her in the fight for justice.