Really hovered between 2 and 3 stars here. Sea of Tranquility is a tightly written sci-fi tale. There's little fat on this book, despite it beginning with a somewhat shiftless dilettante who doesn't play much of a role in the larger story. The book tells the story it wants to tell. There isn't much in the way of detours. That's a sign of a good writer in my opinion, but ultimately the plot failed to really make an impression for me.