In 1921 Paris, aspiring artist Jennifer Chevalier discovers her father's death was no accident and summons his spirit through a mysterious locket, only to accidentally conjure the ghost of Oscar Wilde instead—the celebrated playwright bound to the artifact through a secret romance with her late father. Thrust together by circumstance, Jennifer and Oscar become unwilling partners in a dangerous investigation that pulls them across France, England, and Ireland, where they encounter shadowy government agencies, a clandestine British occult intelligence network, and armed revolutionary forces all seemingly invested in keeping the truth buried. As they unravel the conspiracy surrounding her father's murder, the unlikely pair navigate their shared grief over lost love while forging an unexpected bond, discovering that the secrets they're chasing run far deeper than either anticipated.