Since reading about this delightful crossover by Will Murray and weirdly Lester Dent (by way of a cache of unpublished materials) of the two most famous Street and Smith pulp heroes, I've been most eager to get my mitts on it and read it though. The Sinister Shadow from Altus Book's TheWild Adventures of Doc Savage imprint is a delight in many ways and easily something any fan of Doc Savage or The Shadow must have. For more from Murray on how it came together check this out.
The story, full of action as it is, needed a few more twists and turns. It does do a vivid job of drawing from the early stories of both characters, set as it is relatively early in the careers of both heroes. And we do get some neat switches for the fans. But maybe even more would've been nice. Not as well read in Shadow lore as I am in Doc, I felt most fortunate that I took the time last year to read the first three Shadow novels, they come in handy.
It's a pricey package, but a highly readable one. This one gets the Dojo's highest recommendation.