The 40-year-old's character Hayley Cropper finds herself being held at gunpoint in Underworld during Tuesday evening's instalment, having been lured there by Tony Gordon's accomplice Robbie Sloan (James Fleet).
Seeing her boss Carla Connor (Alison King) bound and gagged to her desk chair, Hayley realises that something's amiss, but starts to panic when Robbie holds the barrel of a gun to her head.
Hayley and Carla's night soon takes a turn for the worse when Tony (Gray O'Brien) turns up at the factory, hell-bent on revenge.
Speaking of her involvement with the storyline, Hesmondhalgh told DS: "I was very excited to be involved in some kind of action drama because that's not my normal place in the show - I'm usually behind a knicker machine or serving butties - so yeah, it was great! I was excited about it but also a little apprehensive because it sounded like a big story, which means long hours, which means being tired... and we're all basically really, really lazy!
Teasing her character's fate, she added: "[Hayley] doesn't make it to the end, that's all I'll say. Whether that's because she escapes, is rescued or is murdered by one of the many psychopaths who are running around Weatherfield at this particular time... I can't reveal - but yes, she's not there to the bitter end."
Click 'play' on the console below to watch our full interview with Julie Hesmondhalgh.
Coronation Street's Siege Week begins tonight at 7pm and 9pm, then nightly at 9pm on ITV1 and ITV HD.
Additional reporting by Chris Allen.
> Corrie's Samia Smith: 'Maria hates Tony'
> Fleet: 'Corrie's Robbie Sloan an enigma'
> Click here to watch the Siege Week trailer
> Click here to read our recent interview with Alison King