Angel Summer is Katie's most popular character. We first met her when she was Britain's No 1 glamour model in Katie's first novel, ''Angel'', and then in ''Angel Uncovered''. Now in Katie's seventh novel, ''Santa Baby'', Angel's glamour days are behind her, she's happily married to Cal and hoping to have another baby. But, as ever, drama is just around the corner, when Angel meets her half sister Tiffany for the first time...As soon as they meet, Angel and Tiffany feel as if they've know each other for years, and before she knows it, Tiffany is working as a stylist on Angel's TV programme and going out with Raul, a Brazilian racing driver who has all the girls after him. If only Angel's sexy bodyguard Sean could be as welcoming. Obviously he has things on his mind, like the kidnap threat hanging over Angel and her daughter Honey. As everyone gathers at Angel and Cal's mansion for Christmas, Sean's defences finally drop. But as he relaxes, Tiffany finds herself in terrible danger...