Bewitching Season by Marissa Doyle

Magic runs in the Leland family, and eighteen year old twins Persephone and Penelope are particularly gifted.  Their talents are put to the test when their beloved governess goes missing right before they are...

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The Night Tourist by Katherine Marsh 

Weird things start happening to ninth grade bookworm Jack Perdu after he is nearly killed in a car accident.  He sees a pale stranger who disappears into thin air, finds a 100 year old map of New York City with his dead mother’s name scrawled on it, and overhears a mysterious conversation about a ghostly underworld that living people cannot enter. But that's just the beginning of his adventure...