The Cousin War (Sweet Valley Twins Ser., No. 90) By Books / Paperback Books ISBN: 055354215X / Publisher: Bantam Doubleday Dell Books for Young Readers, Price Starting at $17.06 Free Shipping Send to a friend Add to Wishlist Below is a list of products arranged by condition. Select the quantity of the product you desire and click the "Add" button. Used - Good Good condition. Book 90. A copy that has been read but remains intact. May contain markings such as bookplates, stamps, limited notes and highlighting, or a few light stains. Bundled media such as CDs, DVDs, floppy disks or access codes may not be included. $17.06 1 in Stock at Warehouse Quantity Add Free Shipping to continental U.S. OR $1.00 per item discount if shipped to store. Reviews Goodreads reviews for The Cousin War (Sweet Valley Twins Ser., No. 90)