Wow! I really enjoy stories that involve time and causality. This series, and especially this last book, were spectacular! Great characters and easily understood paradox theory mixed in with action and a great story of friends that stand the test of time (literally!). Maybe one of my favorite stories involving what happens when someone messes with time. The parallels/alternate storyline with Dungeons and Dragons perfectly paralleled the main story and added a fascinating dimension to this work. HIGHLY recommend reading the series!