Glass Built Castles follows the release of Say You Will from their as-yet-untitled album which is due to see the light of day later this year. Frontman Will Gardner says of Glass Built Castles: "It's the third part of a four-part, four-track story on the Black Peaks debut album. The song deals with a fictitious individual's thirst for revenge and the consequences of his actions viewed by an outsider."

Gardner, who is joined in the band by guitarist Joe Gosney, drummer Liam Kearley and bassist Andrew Gosden, previously released the three-track Closer To The Sun EP last year.