Plagued by rumours that she poisoned her fiancé, Lucinda Bromley manages to live on the fringes of polite society, tending her beloved plants — and occasionally consulting on a murder investigation. The notorious botanist possesses a unique talent: she can detect almost any type of poison. But the death of a lord has shaken Lucinda to her core. At the murder scene, she picks up traces of a poison containing a very rare species of fern — stolen from her conservatory just last month.
To keep her name out of the investigation, and to find the murderer, Lucinda hires fellow Arcane Society member Caleb Jones. As a nearly overwhelming desire blooms between them, they are drawn into a deadly conspiracy that can be traced to the early days of the Arcane Society — and to a legacy of madness that could plunge Caleb into the depths of his own tortured soul…