Ellen Riteman had really been looking forward to the Unicorn Club's ski trip. She was psyched to snuggle by the fire with Curtis Bowman, her new boyfriend. And she couldn't wait to hang out with Rachel Grant, the newest Unicorn. They'd really hit it off. In fact, Ellen and Rachel had joked about how fun it would be if Ellen's mom and Rachel's dad (ski trip chaperones) got married. Then the girls would be sisters!Some joke. To Ellen's surprise, Mr. Grant and Ms. Riteman do get together. And even more surprising is Rachel's insistence that Ellen's mom isn't good enough for her dad. Ellen knows the truth: Mr. Grant can't hold a candle to Ellen's mom. Not only has Ellen changed her mind about having Rachel for a sister-she never wants to see her again!