Magic Undermined

Calliope du Sang is desperate for a romantic weekend with her favourite druid. But between the arrival of unexpected visitors and the calculated maneuverings of a bloodthirsty tree, she's not going to get it.
 
The winter holidays are over, the house guests have left, and freshly fallen snow blankets Salt Spring Island's idyllic hills and valleys. For Calli and Tanner, it's the perfect set-up for three days of adults-only adventures—until other people's pressing problems and a startling discovery blow up their plans.
 
Dead Man's Fingers, a potentially deadly fungus, has Calli's beloved crab apple tree in its grip. No one knows if the eerily human-looking fungus is the result of random spores, or if it was planted by a prior visitor to the property, or if its growing sentience is linked to a malevolent realm.
 
Calli's only option is to protect what is hers: her sons, her land, and her legacy. Which means embracing the magic that flows in her veins and using it to help others—loved ones and enemies alike.

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The Witches of Salt Spring Island series order:
Magic Remembered
Magic Reclaimed
Magic Redeemed
Magic Undermined