Creepy, well told story with a smattering of paranormal. Lovely narration by Richard Armitage.

DNF 

Okay, it´s prediction time:

"Rihannon, listen, I can promise you this - this is absolutely cast iron. I swear on - on my grave, I am never, ever going to sleep with your father."

Because.

It was on the tip of my tongue.

I am never, never going to sleep with your father because -

Thank god I´m almost done with this book.

It was hard to believe that I had ever mistaken it for a regular garden. Now that I knew its history, the warning signs were everywhere. Fat, black laurel berries, the thin needles of yew, straggling patches of self-seeded foxglove, clumps of nettles, which I had taken to be weeds when I first entered the garden but which, I now saw, bore a rusted metal tag dug deep into the earth, labelled Urtica dioica.

 

[Source]

Put a name tag with its latin name in front of a nettle and all of a sudden it becomes the most deadly plant in the poison garden. Or Rowan is such a doofus that she doesn´t know what a nettle actually is. Gosh, this book is bloody stupid.