The Travel Twins and the Lost Secret of the Vikings: The Kare Kids Adventures #4 By Charles A. Salter Books / Paperback Books ISBN: 1478778423 / Publisher: Outskirts Press, September 2016 Price Starting at $49.99 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. Collectible - Good Signed Signed Copy Collectible - Good. Inscribed by author on title page. Stamped on inside. $49.99 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 Travel Twins and the Lost Secret of the Vikings: The Kare Kids Adventures #4