So here we are, book #3 in the series of Books I Stupidly Purchased Because I Was Served Ads on Facebook. The first book, Dead Station (reviewed back in October), was a huge disappointment. The second book, Theodore Roosevelt and the Hunt For the Liopleurodon , was pretty, pretty good. Now we come to the third book, The Sarvan . This book is absolutely awesome! Set during World War I, the book follows a group of prisoners of war who are being led by German guards from a Ge