‘SPOILER ALERT’

the film opens with a female member of a rock band crawls down a hallway in a palatial home

She begs for her life as a man pursues her

The rocker looks to her side to find another bandmate dead with his face split open

The pursuer catches up, and bashes the rocker’s head in with a hammer

Jumping ahead in time the Foo Fighters  a famous rock band

are meeting with their manager Shill to discuss their 10th album

Frontman Dave Grohl is suffering from a musical block unable to think of any new songs

Shill is not empathetic saying that he has debts to pay

and therefore, the Foo Fighters need to make a new record ASAP

Grohl says that he wants to try something different than recording in a studio in order to get him past his block

Shill contacts a property manager named Barb Weems to rent a house for them that will help the band find inspiration

The band including Dave Grohl, guitarists Shiff and Pat Smear, bassist Nate Mendel, keyboardist Rami Jaffee and drummer Taylor Hawkins

arrive at the mansion from the beginning of the film

Weems shows them around the property

and Grohl has psychic visions of the slaughter depicted at the beginning of the film

Liking the atmosphere and being influenced by the supernatural Grohl convinces the band to stay and record at the house

While setting up equipment

one of the crew members dies in an electrical accident caused by a spectral being

But Grohl convinces the band to continue recording at the house in his honor

However, Grohl remains uninspired

even trying to rip off a song made by another artist “cameo by Lionel Richie”

They also, meet next-door neighbor Samantha who tries to befriend the band

One night, after Grohl has demon-plagued nightmares

he awakens and follows a figure moving through the woods

He is led to a decrepit basement structure

Inside, Grohl finds a dead raccoon split open and nailed to the wall above a drain

He also finds an audio recording from a band, called Dream Widow shown being killed at the beginning

He plays the recording and rocks out

However, the recording suddenly plays backward on its own and Grohl is possessed by an unseen spirit

The next morning, Grohl summons the band and plays an amazing guitar solo

He claims to have invented a new musical key the key of L

and gets the band to have a productive rehearsal

Grohl dismisses the crew “cameo by John Carpenter” so that the band can continue recording on their own

That night, Grohl blows off a delivery guy

who has his own band and idolizes the Foo Fighters

The Foo Fighters continue to record and the band members try to cater to Grohl’s increasingly fickle demands

When Samantha drops off cocaine-infused lemon bars, she warns the band that murders occurred in the house

Grohl orders some groceries and the delivery guy is killed

when he follows demonic figures into the woods while making the delivery

That night

Grohl eats his steak raw much to the band’s disgust

As time passes, the song they are recording goes over 30 minutes

Weems visits and finds the house in a filthy condition and the band reaching their breaking point with Grohl

Eventually, Shiff angrily confronts Grohl before leaving rehearsal to grill some lunch

While grilling, Grohl sneaks up behind him and kills him by burning him to death on the grill

Meanwhile, Hawkins finds the delivery guy’s disemboweled and beheaded corpse

The band wants to call the police

but Grohl confiscates their phones and car keys

demands they finish the song now in honor of the delivery guy

The band decides to meet secretly

to discuss Shiff’s disappearance and what to do about Grohl and the song, which is now over 40 minutes

They ask Samantha about the house’s history

She reveals that she was a groupie for the Dream Widow band

She explains that the band and Samantha herself began dabbling in the dark arts in order to enhance their music

and that the mansion is located atop a portal between Earth and Hell

The Dream Widow front man found a cursed book that was activated by sacrificial blood

the front man used raccoon blood to commune with demons

The demons eventually possessed the front man in an effort to record a hellish rock song

The front man killed his band while possessed, but then killed himself  to prevent the song from being finished

She says that the same demon is now possessing Dave Grohl and the band agrees

Smear and Mendel go to find the book as it contains an exorcism spell

Hawkins is sent to distract the now demonic-looking Grohl

Grohl kills Rami and Samantha and then finishes recording the song with Hawkins, before killing him too

He also eats Shiff’s body as demons crave human flesh

Smear and Mendel find the cursed book hidden under the drain beneath the dead raccoon carcass

They are accosted by demons but manage to escape

Grohl pursues his remaining bandmates but they manage to complete the exorcism spell to break the possession

Grohl pukes out the spirit of the Dream Widow front man

he then beats up the demonic front man

before the spirits of the Dream Widow band drag their front man to Hell where he can be tortured

As Smear, Mendel and Grohl walk to their van to leave the house, they are confronted by Shill and Weems

It turns out that the pair are satan worshippers, that set everything up

Smear and Mendel try to hotwire the car so they can escape while Grohl fights Shill

Unfortunately, Weems confronts the bandmates and all three die

Grohl almost manages to kill Shill but stops when Shill begins laughing at the realization, that the band completed the song

Shill notes that this song will save Rock and Roll and that it’s time for Dave Grohl to be a solo act

The film jumps ahead one year to a Dave Grohl solo concert An excited crowd chants his name

As Grohl prepares to go on stage to perform the demonic song his eyes turn black showing

that he is now permanently possessed  by evil

Studio 666.