Books like Shell House by Jane Thynne

Sisters Vianne and Isabelle are pulled into the turmoil of World War II, each forging a path of courage and resistance against the Nazi occupation of France.

Two young lovers, Tommy and Tuppence Beresford, form a private detective agency and are hired to locate a missing woman named Jane Finn, whose disappearance threatens post‑war Britain.

A historical mystery set in 18th-century London that explores themes of women's empowerment and time travel in a twist of fate, featuring a precocious girl solving centuries-old murders.

Twin African American sisters flee their hometown after their father's murder—one chooses to pass as white while the other stays true to her identity, exploring race, family, and the complexities of self through generations.

An American college girl in 1947 discovers her belated quest to uncover the fate of her vanished French cousin during WWI, leading her to the shadowy Alice Network where a former spy haunted by betrayal seeks vengeance.

A clever and dangerous spy romance, where the Byron brothers' code battles the French secret agent who wants to be a man and woman’s love, while also saving his family and breaking into the most powerful codes of the time.

A reporter turns to a reclusive journalist for protection, forming an unlikely marriage against a backdrop of secret identities and dangerous threats.

Suzanne Brockmann’s "Born to Darkness" is a fiction thriller that examines the intersection of U.S. special forces, drug–control efforts and cartel power struggles, while delving into hormonal influences and man‑woman dynamics.

Claim and Protect is a contemporary romance novel by Rhenna Morgan, exploring the intricacies of modern man‑woman relationships.

"Born out of wedlock to a former Mennonite girl, Mary Penner lived on the edge of society until the day her mother was killed in a drug bust. Sent back to her grandparents at age fourteen, she found fitting in with their simple society very difficult. As an adult now, she enjoys the security and peace her faith gives her - even if the people still hold grudges against her and whisper about the notorious shunning of her mother. Abe Glick has been fascinated with Mary since the first day she walked into his life. Different from the rest of the girls, she captured his imagination and his heart. But capturing her heart will be a difficult task since Mary keeps it locked up tight, hidden behind walls of self-imposed guilt and pain. When her past confronts her, will her world come tumbling down, or will she finally see herself free?" -- Cover verso.

A steamy romance where a New York private investigator encounters a demon—fashion, demonology, and man‑woman dynamics collide in this hot, contemporary fiction.

"In the whole state of Montana, there's nowhere to hide. Laurel Hodges has changed her identity twice. She's been on the run for the past four years, trying to outdistance the men who blame her for the death of one of their own. She's finally found the peace and stability she needs, for herself and her two children, in the small town of Pineview, Montana. But just when she thinks they're safe-- the nightmare starts all over again. The Crew, a ruthless prison gang with ties to Laurel's brother, will never forget and they'll never forgive. And now that they've finally found her again, they'll stop at nothing. It could all end in seconds. Only Sheriff Myles King stands between Laurel and the men who want her dead" -- author's web site.

A forbidden romance that puts Pia's heart on the line in the ultimate wedding escape from the past.

In a Montana town, a veteran coping with PTSD and a newly-divorced woman named Jillian form an unexpected bond that reshapes their lives, exploring friendship, family, self‑confidence, and the complexities of ranch life.

A first‑time thriller that spins a tense love triangle, in which a mother’s obsessive bid to keep her son with her threatens the life of the woman he loves.

A romance novel about a single father and a delicate schoolteacher trying to build a family together on a ranch.