Caitlin and Caleb find themselves once again back in time—this time, in the London of 1599. It's a wild place, filled with paradoxes, and in this environment Caitlin and Caleb land, on the search for her father, for the third key, for the mythical shield that can save humankind. Their mission takes them through a whirlwind of London's most amazing medieval architecture, through the British countryside's most breathtaking castles. It takes them back into the heart of London, where they just might meet Shakespeare himself, and see one of his plays live. It brings them to a little girl, Scarlet, who just might become their daughter. And all the while, Caitlin's love for Caleb deepens, as finally they are together—and as Caleb might just finally find the perfect time, and place, to propose to her. Sam and Polly have traveled back too, and as they find themselves stuck together on their own journey, their relationship deepens, as they each despite themselves can't help feeling more deeply for each other. But all is not well. Kyle has come back, too, as has his evil sidekick, Sergei, and they are both intent on destroying everything good in Caitlin's life.