This summer, beware of sharks... Mega bestselling and award-winning author Tiffany D. Jackson (The Weight of Blood; White Smoke) makes her thrilling middle-grade debut with a can't-put-it-down murder mystery set on Martha's Vineyard. Brooklyn girl Kaylani McKinnon feels like a fish out of water. She's spending the summer with family friends in their huge house on Martha's Vineyard, and the vibe is definitely...