(Silver Streak Comics 006, 1940)
Continuing from the story of the Panther, Ace Powers ventures into the hole he had left the villain and his Panther Men in, seeking to discover the location of the former and presumably the reason for the deaths of the latter. Making his way through a concealed door, Powers finds the Panther about to be executed by a third villain called the Spook, who states that he is doing so because the Panther failed him, presumably by being foiled by Ace Powers in the previous issue. And let me tell you: I almost always love the revelation that a super-villain is in fact merely an agent of an even more evil villain but I especially love the fact that this means that the Panther Men were essentially subcontracting villainy.
The Spook captures Powers with the help of his rad Skeleton Men and of course offers him the chance to join up with an organization where failure will get you gruesomely killed (it's an understandable no from Our Hero). He also lays out his deal, kind of, and this is where we get into the very frustrating thing about the Spook: he's clearly a vampire, but this comic won't just come out and say it. Check it out: sharp canines, lives underground, "my body cannot stand sunlight." Even that mantled robe he's wearing is pretty reasonable comic book vampire fashion for the early 1940s.
Plus, there's the Skeleton Men, who are again rad as hell and are described as being animated by the Spook's will alone (yes, he says "hypnotic" there but really that's about the same as describing your power as "quantum" in a comic from 2010 only for magic). That's some vampire shit right there.
Ace Powers manages to knock the Spook out with a solid right to the jaw, which disables the Skeleton Men as well - this raises some questions about how security works while the Spook is enjoying a nap, or it would do if he weren't clearly a vampire.
To cap off the frustration, Powers decides to rid the world of the Spook with a simple bundle of dynamite rather than for instance dragging him out into the sun to shrivel up, a clear violation of my right to see vampires shrivel up in the sun from time to time. It's a good thing that this is your final appearance, Ace Powers, because I now have a grudge against you and I would hate to have that taint my reading experience going forward.