In the most thrilling installment yet, Cam and Alex are separated by the evil Thantos—and find their powers are halved. Can the twins reunite before one of them is drawn to the dark side? Together, t*witchy teens Cam and Alex are a magickal force to be reckoned with. But, when apart, the twins can be susceptible to great danger. That's just what the wicked Thantos has in mind when he lures Cam to Coventry Island for the summer, leaving Alex in Marble Bay. While Cam is romanced by the magnetic and mysterious Shane, Alex makes a new friend who seems trustworthy...or is she? As Cam moves further away from Alex, she learns ever more about the twins' past—and future destiny. But her knowledge seems to be pulling toward the dark side. Will Alex be able to save her sister in time?