A Druid's Secret - The Olkaster Academy Series, #1

When myths emerge from the shadows, a druid's dark powers are the key to unravelling a centuries-old secret. Tabatha Blackwood can't wield magic to save her life. Her spells backfire and her potions are only good for burning holes in the floor. Olkaster Academy, an elite magical school, is her only hope.  Her unique power to detect magical energy is the only thing that doesn't get her into trouble, until she stumbles through a bewitched door in the castle dungeons.
After witnessing untold horrors, Tabatha becomes embroiled in an ancient war between Olkaster's two secret societies: the Skyseers and the Nightcasters. The mysterious and dashing Leo Calhoun is determined to help keep Tabatha out of trouble. Yet, the further they are sucked into the societies' ever-growing tensions, the more Tabatha realises there is more to his past than he is willing to admit.  When Tabatha discovers that her abilities could tip the balance of power between the two societies, she must decide where her loyalties lie.
But if this druid's secret falls into the wrong hands, her powers, her future and even Olkaster itself might not survive to see next semester.