Nine-year-old Poppy Malone's parents are paranormal investigators. They research vampires, fairies, UFOs, and other strange things. When they need help, it's up to scientific Poppy. Her twin brother, Will, is too lazy. Her older sister, Franny, is too busy with teenage stuff. And Rollie, the baby of the family, is too little. In the third book in the spooky and hilarious Unseen World of Poppy Malone series, A Mischief of Mermaids, Poppy makes...