Cheryl''s relatively small backyard was festooned with streamers and balloons and crowded with yelling kids. Portable tables sagged under custom-made cakes and piles of brightly wrapped presents, while two clowns and a slightly ratty Cinderella mingled with miniature guests, all of them sugar-jazzed. Austin''s childhood pony, Bamboozle, trucked in from the Silver Spur especially for the birthday party, provided rides with saintlike equanimity. Keeping one eye on the horse and the other on his daughters, six years old as of 7:52 that sunny June morning, Tate counted himself a lucky man, for all the rocky roads he''d traveled. Born almost two months before full term, the babies had weighed less than six pounds put together, and their survival had been by no means a sure thing. Although the twins were fraternal, they looked so much alike that strangers usually thought they were identical. Both had the striking blue eyes that ran in the McKettrick bloodline, and their long glossy hair was nearly black, like Cheryl''s and his own. His girls were healthy now, thank God, but Tate still worried plenty about them, on general principle. They seemed so fragile to him, too thin, with their long, skinny legs, and Ava wore glasses and a hearing aid that was all but invisible. Cheryl startled Tate out of his reflections by jabbing him in the ribs with a clipboard. Today, her waist-length hair was wound into a braided knot at the back of her neck. "Sign this," she ordered, sotto voce