I just finished reading Barnabas Tew and the Case of the Nine Worlds by Columbkill Noonan. This book is the second in the Barnabas Tew Mystery series.
Victorian private detective Barnabas Tew and his loyal assistant, Wilfred, have left the heat of the Egyptian Underworld behind them and are now facing the cold of the Norse afterlife. Tasked by Odin, with Brynhild as their guide, the intrepid due travel the nine worlds of Norse Mythology in search of a stolen silver bowl. Will they be able to find the bowl and return it to Sigyn before Loki escapes or will it be the end of the world?