Mystery of the Sacred Stones

From the Back of the Book: Can you unlock the deadly secret of the Sacred Stones? A trip to Florida seems like a great way to spend a summer vacation, until you find one of the mysterious Calusa Gull Stones. According to an ancient Indian legend, the stone has a mate, and if the two are paired, a terrible power will be unleashed. You're determine to find the stone's mate--and destroy them both--before a deadly time-traveling spirit can use their power. But will you be able to locate the other sacred stone and stop this ancient evil before it's too late?