The Crimson Phoenix

Read this review for an interesting insight into the title.  This cover is okay as a pulp cover, but not as a Shadow cover.  Sure, there is the silhouette present but that seems like a patch done in Photoshop (and yes, I know Photoshop didn't exist in '38) rather than an original painting just for this tale.  This is a Tinsley story and I haven't gotten that far in the series so I can't comment from experience about this entry into the annals of "The Shadow".