"Ada, Iggy, and Rosie are having a sleepover-and Iggy wants to make it the most epic sleepover ever! They've got their pajamas, sleeping bags, and yummy snacks. But when Ada suggests they play a game of Ping-Pong in the basement, Iggy says they can't go down there, because the basement is . . . haunted! Or at least he thinks it is. Is there actually a ghost in Iggy's basement? Ada, Rosie, and Iggy decide they're going to find out!" -- Cover.