Novelist and professional companion Evangeline Ames has rented a cottage in the outskirts of Little Dixby, far from the London streets where she was recently attacked. Fascinated by the paranormal energy of nearby Crystal Gardens, she finds some pleasurable diversion in sneaking past the wall to explore the grounds. And when her life is threatened again, she instinctively goes to the gardens for safety. Lucas Sebastian has never been one to ignore a lady in danger, even if she is trespassing on his property. Quickly disposing of her would-be assassin, he insists they keep the matter private. There is plenty of whispering about him already, with rumors of treasure buried under his garden, and occult botanical experiments performed by his uncle-- who died of mysterious causes. They soon discover that they share a common enemy-- and as the dangerous energy emanating from Crystal Gardens grows stronger, they realize that to survive they must unearth what has been buried for too long.