Nailed it. Each episode reimagines a classic Poe tale as the method of death for each of the Usher descendants (don't think that is much of a spoiler). There are bonus references throughout the show and even a bonus reimagining of "The Cask of Amontillado" that isn't in an episode title. The character names are fun references - Roderick's wife is Annabel Lee, his granddaughter is Lenore (lost love in "The Raven"), August Dupin is the "detective" in "The Murders in the Rue Morgue", Carla Gugino's character is Nerva - an anagram of Raven, Rufus Griswold (the evil CEO of Fortunato) has the same name as an editor/anthologist with whom Poe had a famously contentious relationship, and of course Fortunato (the Usher's company) shares the name of Montresor's rival in "The Cask of Amontillado." There are lots of other Poe references that are fun to look for throughout the show.
It's a fun series, though far from perfect. But having Gugino in the show papers over a lot of flaws for me.