Title: The Perfect Poison:(Arcane Society, #6)
Description: Plagued by rumours that she poisoned her fiance, 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.

Arcane Society Series: (note-has series overlap)
Second Sight (Arcane Society, #1)
White Lies (Arcane Society, #2)
Sizzle and Burn (Arcane Society, #3)
The Third Circle (Arcane Society, #4)
Running Hot (Arcane Society, #5)
The Perfect Poison (Arcane Society, #6)
Fired Up (Arcane Society, #7; Dreamlight Trilogy, #1)
Burning Lamp (Arcane Society, #8; Dreamlight Trilogy, #2)
Midnight Crystal (Ghost Hunters, #7; Arcane Society #9; Dreamlight Trilogy #3)
The Scargill Cove Case Files (Arcane Society, #9.5; Looking Glass Trilogy, #0.5)
In Too Deep (Arcane Society, #10; Looking Glass Trilogy, #1)
Quicksilver (Arcane Society, #11; Looking Glass Trilogy #2)
Canyons of Night (Rainshadow, #0; Ghost Hunters, #8; Looking Glass Trilogy, #3; Arcane Society, #12)
Subjects: Women botanists, Historical Romance, Psychic ability, Arcane Society (Imaginary organization), Fiction, Fiction, romance, suspense, England, fiction, Fiction, mystery & detective, historical