Crystal Earrings : The Children of Pisces, Book 2 -- Hardback

MINA is the third protagonist and quadruplet introduced in the saga and is a feisty tomboy with attitude. She possesses a pair of crystal earrings which camouflage her against any background,giving her the power of invisibility,along with the ability to walk through structures such as walls and move,without touch,solid objects like metal and wood.