The Last Test by Adolphe de Castro and H. P. Lovecraft

A brilliant but morally ambiguous scientist creates a serum that could eliminate disease—but at the cost of tampering with forces beyond his understanding. As he prepares to test his final experiment on a human subject, an old friend watches events unfold with growing unease. The story explores ambition, scientific ethics, and the consequences of playing god. The plot leads to a dramatic and tragic climax. A mad science tale where the final trial could destroy more than just the subject.