This was a great read!
Keep in mind that the gender roles are typical of the time period in which it was written, and you'll have a wonderful time with this adventure romp. I kept "turning" pages, wondering what our villain would have up her sleeve next.
The ending was a little weak - it seems as though Wallace might have been setting up for a sequel.
A fun, little gem of a story!
I thought that I had predicted the ending, but I was surprised at the final twist at the end. The heroes are appropriately manly, the distressed damsel appropriately helpless, and the villains appropriately evil!