Twins - Book 21: A Dream Come True This book is the finale to the fabulous Twins series and includes more excitement, drama, and romance. While life has taken a positive turn for the two girls, Casey and Ali find themselves faced with new challenges. Once again, they are unprepared for what is in store, especially when Ronnie and Holly seem determined to make things difficult. However, a long-awaited announcement is made and the twins' biggest dream of all, finally does come true. You are sure to love this book for girls 9-12. It's another great story and a wonderful ending to the Twins collection.