After being dumped by both his girlfriend Nicky (Margo Stilley) and his band in the same week, Alex (Leo Gregory) seems condemned to a life of soulless drudgery, endlessly repeating somebody else’s scripted lines down a call-centre telephone. Then out of the blue he is offered the chance to have his music included on a compilation album, just so long as he can come up with a new track by Monday – and so he and his best friend Maddy (Eva Birthistle) arrange with old band member Dan (Luke De Woolfson) to be locked in for a double nightshift at Iron House, the professional recording facility where Dan now works.
Stuck for ideas, Alex takes inspiration, and a sample, from a song that he hears late at night on the studio’s radio – a song that was in fact the final recording of artist Mark Griffin before his suicide in the early 1970s. Soon Alex is working away like a possessed man on his track, but with phantom sounds bleeding their way into the recording, objects mysteriously moving about and internal phone calls coming from empty rooms, Maddy becomes increasingly convinced that there is someone – or something – else trapped inside with them, desperate to get out. Soon everyone will be drawn from the studio’s modern central complex down to the bricked Victorian basement beneath where, in an old tiled ‘live room’, the past threatens to repeat itself in the reverberating stir of echoes.