Books like Tightrope by Jayne Ann Krentz

During World War II, Winston Churchill selects an unlikely history professor, Alfred Vicary, to expose a covert traitor, while the Nazis deploy a beautiful widow, Catherine Blake, as a spy to uncover Allied plans for D‑Day.

In the Regency era, Prudence Merryweather defies social norms, courting the enigmatic Earl Sebastian Angelstone to protect her family and confront dangerous duels, creating a passionate and perilous romance.

In a charming seaside village, Harriet Pomeroy hires the formidable Gideon Westbrook, Viscount St. Justin, to fight thieves using her caves—yet she discovers that the man she summons is the feared Beast of Blackthorne Hall.

Venetia Milton, a struggling photographer, poses as a widow to maintain her gallery after her enigmatic employer’s murder, only to discover she and the dead man share a psychic bond that draws them back into danger.

A historic mystery that unites three women across a century, linking their lives to the doomed RMS Lusitania as they race against time to expose a conspiracy that could alter history.

"I very much need to be dead." These are the chilling last words left by a man who had everything to live for but took his own life. In the void that remains stands his widow, FBI agent Jane Hawk, surrounded by questions destined to go unanswered unless she does what all the grief and fury inside her demand: Find the truth, no matter what. People of talent and accomplishment, people seemingly happy and sound of mind, have recently been committing suicide in surprising numbers. A disturbing pattern is beginning to emerge. Jane is determined to give up everything to find out why. And if that means going rogue and becoming America's Most Wanted, then so be it. Those arrayed against her are legion, and devoted to protecting something profoundly important-or terrifying-enough to exterminate any and all in their way. But Jane is as clever as these enemies are cold-blooded, as relentless as they are ruthless. And she is driven by a righteous rage they can never comprehend. Because it is born of love.

In Victorian London, Calista Langley runs an elite introduction agency while a cryptic stalker sends her mournful gifts. Seeking help, she enlists reclusive crime novelist Trent Hastings, and together they uncover that the danger may stem from Calista’s hidden past.

In "In Too Deep" psychic investigator Fallon Jones and runaway Isabella Valdez uncover a secret conspiracy in the secluded coastal town of Scargill Cove.

A mysterious murder leads Lucinda Bromley, a botanist, to join the Arcane Society and uncover a web of deceit involving psychic abilities and a legacy of madness.

When evidence of sabotage is uncovered, Boston Navy Yard secretary Mary Stirling and Navy officer Jim Avery work together to discover the culprit.