Everything's about to change for Cat. She's moving house, so she'll have a room of her own at last, and her dad's about to marry Jen, which means a shopping trip to London and a chance to meet up with her new mates, Nesta, Lucy, Izzie and TJ, as well as see her new love interest – Jamie.But nothing goes as expected – Cat's dream room looks like a non-starter, Jamie does a disappearing act, and wedding plans fall apart. How will Cat cope, and will she keep her promise to reveal a hidden secret to her friends?