Psychedelic drugs turn an impromptu house party into the stuff of nightmares on Coronation Street next week, when the youngsters of Weatherfield are haunted by hallucinations.

With locals including Amy Barlow, Asha Alahan, Betsy Swain and Lauren Bolton in attendance, the party soon takes a dramatic turn when someone accidentally takes LSD.

Meanwhile, after Summer Spellman and Nina Lucas knowingly take the substance, their fun turns deadly…

“The night takes an unexpected turn, leaving Summer and Nina distraught,” shares Harriet Bibby, who plays terrified Summer.

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“Even without the drugs they’d be feeling really shocked and upset about what happens to them, so times that by 10 with the LSD in their system. They’re really worried and scared…”

The frightening events of the evening begin as Aadi Alahan takes Bernie Winter’s advice and hosts a spontaneous midsummer party to liven up his boring life.

But the partygoers’ innocent fun is soon sabotaged when Brody Michaelis arrives with a bottle of LSD…

As the gathering gets going, Aadi is left upset when a romantic moment between him and Amy turns into a misunderstanding. His mood sours even more when he spots Brody with LSD and kicks him out – but when he empties the drug into three cups, some of the guests decide to experiment.

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ITV

“We see the effects of the drugs hit Nina and Summer, and they seem to be having a lovely time,” explains Harriet.

“Then the police arrive – or so they think, it’s actually just DS Swain and Carla looking for Betsy. But Summer and Nina get very paranoid because they know they’ve taken something they shouldn’t. So they decide to duck out of the party.”

It’s after the pair leave the house that the situation takes a dangerous turn. Confused and high, Nina and Summer head to Roy Cropper’s café. They sit in the dark and begin to panic when they hear police sirens. What’s happened to them during their drug-fuelled night?

“Nina and Summer witness something,” teases Harriet. “They’re not sure what was real or what were hallucinations. They re-trace their steps and look for any clues that might help them remember something solid.”

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ITV

The morning after, Summer and Nina try to make sense of what they saw. But as they try to piece together what happened, someone else’s condition deteriorates after unknowingly taking LSD. Will Summer and Nina come forward?

“Nina wants to report what they’ve seen,” reveals Harriet. “But Summer thinks there’s no point as they don’t know for sure whether something happened. They look back on the night with regret – it’s not just Summer and Nina in a dangerous situation…”

Scared by what she remembers, Nina betrays Summer and opens up to Roy. But while Roy urges his niece to go to the police, Kit Green tells Aadi he’ll need to make a statement about the drugs at the party.

Will the partygoers be honest about what happened when they were under the influence? Or will they keep quiet and live with the guilt?