Zoraida Grey and the Family Stones

Granny's dying, but Zoraida can save her with a magic crystal of smoky quartz. Too bad the crystal is in Scotland--in a haunted castle--guarded by mind-reading, psychopathic sorcerers.

Getting inside Castle Logan is easy. Getting out––not so much. Before she can snatch the stone, Zoraida stumbles into a family feud, uncovers a wicked ancient curse, and finds herself ensorcelled by not one but two handsome Scottish witches.

Up to their necks in family intrigue and smack-dab in the middle of a simmering clan war, Zoraida and her best friend Zhu discover Granny hasn't told them everything.
Not by a long shot.