"McIlvaine's Star" by August Derleth is a science fiction narrative written in the early to mid-20th century. It centers around a character named Thaddeus McIlvaine, an eccentric amateur astronomer who claims to have discovered a dark star and embarks on a quest to communicate with its mysterious inhabitants. The story explores themes of belief, alien encounters, and the search for understanding and connection across the cosmos. In the tale, Thaddeus McIlvaine shares his discovery with a group of friends at a tavern, who respond with skepticism and humor. Undeterred, McIlvaine engages in communication with beings on his dark star, believing he possesses the means to connect with them through a home-made device. As the story progresses, McIlvaine's communications unveil a curious alien civilization, culminating in an ominous revelation that a war against humanity is imminent. The proceeding disappearance of his friend Richardson, coupled with McIlvaine's own enigmatic fate, leaves readers questioning the boundaries between sanity and belief, reality and imagination. Ultimately, the novel presents an exploration of an individual's quest for validation and recognition amidst isolation from both peers and an alien world. (This is an automatically generated summary.)