Secrets of the Zodiac Books in Order

Cordelia Bering rejects marriage to protect a dangerous secret, until Crown agent Sebastien Thorne enters her life. Investigating a mystery with Continental connections, the Zodiac spy must determine whether Cordelia is distracting him or holds the key to his mission.

Former Zodiac spy Nathan Bancroft discreetly investigates problems his wealthy clients cannot acknowledge. Hired to explain Vanessa Phillips's monthly payments to a stranger, he encounters a woman whose wit and guarded past challenge both his professional detachment and buried regrets.

After her fiance's death, mathematically gifted Sarah Brecknell is left with a dangerous secret and turns to a Crown agent. Theodore Markham is hunting a former friend turned traitor, and Sarah's abilities may prove crucial to his pursuit.

Astronomy enthusiast Violet Holloway enters a marriage of convenience with Alexander Kenyon, a duke whose previous wives died mysteriously. While he investigates murders for the Zodiac, the couple must work together to stop another killing and protect their new relationship.

Lord Ian MacLachlan's brothers return to his Highland estate with an unexpected captive, Miranda Worth. Ian offers to send her home, but Miranda has fled an intolerable situation and conceals the truth even as she grows drawn to him.

Gemma Harrington wants to escape her life among smugglers and con men. Zodiac agent Logan Hartley offers her passage anywhere his ship can sail if she helps infiltrate a smuggling ring, making their partnership both tempting and dangerous.

New Zodiac recruit Ashley Allander seeks an elusive inventor and encounters Nora, a brilliant woman imprisoned after being declared insane. Her stolen work and desperate appeal draw him into a conspiracy linking two nations, with her freedom and their lives at stake.

Cameron, Lord Deverall, hides his work as a Zodiac spy behind a frivolous public image. His next mission requires the help of his estranged wife Genevieve, reopening the wounds that drove them apart and offering an uncertain chance at reconciliation.

Zodiac agent Royce Holmes pursues a forger undermining Britain's war effort when he meets Tamsin Black. Hiding her name, past, and criminal connections, Tamsin seeks safety, but their growing attraction becomes entangled with the hunt for a dangerous spy.