M. G. Leonard and Sam Sedgman have done it again. This was another exciting, gripping and intriguing mystery, once again set in a fabulous setting (this time the Arctic). I read most of the book in one sitting. 

This isn't my favourite of the series, but that is only because the standard is so very high - Sabotage on the Solar Express in particular is a strong competitor for the best middle grade mystery/thriller I have ever read. I still absolutely loved The Arctic Railway Assassin and anticipate many rereads in my future.