The Professor Wore Prussian Blue by Shelley Adina

https://thebookvoice.com/podcasts/2/audible/140620 to listen full audiobooks. Title: The Professor Wore Prussian Blue Series: Mysterious Devices, Book 6 Author: Shelley Adina Narrator: Fiona Hardingham Format: mp3 Length: 6 hrs and 17 mins Release date: 12-05-23 Ratings: 5 out of 5 stars, 5 ratings Genres: Alternate History Publisher's Summary: Daisy and Frederica Linden, having finally found their beloved father, Professor Rudolph Linden, are on the last leg of the journey they began so long ago. The only thing now in their way is the notorious gang of air pirates who haunt the archipelago between Port Townsend and Victoria. Corporal Kent of the Royal Canadian Airborne Police gallantly offers to escort their conveyance in an official airship, hoping against hope that Freddie will fly with him and give him an answer to a very important question.