This is not the most successful book in the series.  It is very short on information.  Shackleton was a young man who wanted to explore and explore.  He even survived multiple trips to Antarctica.  This book just seems to rush through his most adventurous days.  For example, how did they live on floating ice.  How long did the trip take, etc. There is just not enough information to really get at the core of who Shackleton was and why he is important to history.