Plagued by rumours that she poisoned her fiancé, Lucinda Bromley lives on the fringes of polite society, tending her beloved plants - and occasionally consulting on a murder investigation.
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 it, and to find the murderer, Lucinda hires fellow Arcane Society member, Caleb Jones.
As desire blooms between them, they are drawn into a deadly conspiracy that can be traced to the early days of the society - and to a legacy of madness that could plunge Caleb into the depths of his own tortured soul...