Girls are taken to a castle on the hill for magic training; they're split into four groups and have daily lessons in spirits and poisons; and one of them might be the chosen one and keeps making trouble.
Familiar? Yes, but Harry Potter has nothing on these witches, and Mark has woven a fine tale of friendship and sistership, treachery, intrigue and good old-fashioned kick-ass nuns.
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Next up, Interview with the Vampire for #Scarathlon buddy read