What happens when you mix the madness and horror of writer H.P. Lovecraft, the fantastic sweep of George R.R. Martin's "A Song of Ice and Fire" and blistering, melodic heavy metal? You get Seven Kingdoms' new EP, "In the Walls."

The four-song set, which will be released Sept. 30 after a successful crowdfunding campaign through Kickstarter, premieres exclusively today on Speakeasy.

The EP's title track is inspired by Lovecraft's 1924 short story "The Rats in the Walls," which is about a man who is driven to insanity after learning the horrific history of his ancestral estate in England. In the song, vocalist Sabrina Valentine assumes a point of view similar to the protagonist, proclaiming innocence and blaming the demonic "rats in the walls" for a hideous crime.

"I thought it would be an awesome contrast to have upbeat, melodic music paired with sick and twisted lyrics," says Seven Kingdoms guitarist Kevin Byrd, who counts Lovecraft as one of his favorite authors.

But it's another literary superstar who looms more heavily over Seven Kingdoms's work, and the proof is right in the band's name. It's a reference to the realms in Martin's gritty fantasy novels, which have inspired HBO's blockbuster series "Game of Thrones." The Florida-based band was established in 2007, four years before the show first aired, and its first album, "Brothers of the Night," was a concept album inspired by Martin's novel series, "A Game of Thrones."