Lisa Swain has quickly become one of Coronation Street’s most intriguing characters, and her story is about to take another gripping turn. Known for her no-nonsense approach and razor-sharp instincts, Lisa’s intuition rarely steers her wrong.

This week, after being tipped off about Kit’s questionable behavior, she begins to look more closely at the people around her—and that’s when she spots something that changes everything. A slip-up by her superior, DI Costello, raises alarm bells and leaves Lisa wondering: just what exactly is her boss hiding?

For months now, the tension in Weatherfield has been simmering beneath the surface. Kit’s actions have increasingly come under scrutiny, and although some on the Street have tried to dismiss his behavior as mere recklessness, Lisa has been watching with a keener eye. She knows there’s more to Kit than he lets on, and when a concerned figure finally warns her outright to keep a close watch, she doesn’t take the advice lightly. But it’s not Kit who first stumbles—it’s DI Costello. During what seemed like a routine exchange, he slips up, revealing knowledge he shouldn’t have, or perhaps forgetting the version of events he previously gave. For someone in his position, it’s a glaring mistake.

Lisa is no stranger to liars, but what unsettles her most is that this deception comes from a man she’s supposed to trust above all others. DI Costello has long been regarded as steady and authoritative, someone who demands respect. Yet Lisa can’t shake the sense that beneath the confident exterior, cracks are beginning to show. A single inconsistency might be nothing, but Lisa’s instincts scream otherwise. In her line of work, those little tells often signal the presence of much deeper secrets.

Rather than confront him outright, Lisa plays it carefully. She masks her suspicion, listening more than she speaks, letting Costello’s words hang in the air. She knows better than to tip her hand too soon. Instead, she files the slip-up away and begins to quietly watch him, noting other subtle signs that don’t quite add up: the unusual phone calls he steps out to take, the strange defensiveness when Kit’s name is mentioned, the vague explanations about his whereabouts. The more she observes, the more uneasy she becomes.

Fans of Coronation Street are used to deception and double-dealing, but this storyline feels particularly tense because it pits Lisa against someone in a position of authority. Costello isn’t just another resident on the cobbles—he’s her superior, and that gives him both power and protection. If Lisa is right about him, she’s treading on dangerous ground. Not only could her career be at risk if she pursues this, but she could also be putting herself in the crosshairs of something far darker than workplace politics.

At the same time, Lisa can’t ignore her conscience. She knows too well the consequences of letting suspicious behavior slide. Her determination to seek justice, even when the odds are against her, is what makes her stand out from so many others. This is why fans have warmed to her so quickly: she’s a fighter, someone who won’t look the other way when people in power abuse their position. In Costello’s case, Lisa suspects that what’s at stake may go far beyond personal secrets—it could be linked to Kit and whatever schemes he’s been entangled in.

The dynamic between Lisa and Costello promises to be one of the most riveting aspects of this unfolding drama. While he projects authority, Lisa has the subtle edge of being underestimated. Costello clearly doesn’t see her as a threat, which only makes her more dangerous. As she quietly gathers observations, she’s essentially laying the groundwork for an investigation of her own. If she plays her cards right, she could unravel whatever he’s hiding before he even realizes she’s onto him.

Of course, the writers at Coronation Street are masters of suspense, and they won’t give away answers too easily. Theories are already swirling among fans: could Costello be covering for Kit’s shady dealings? Is there corruption in the ranks, with Costello pulling strings behind the scenes? Or is it possible that Costello himself has skeletons in his closet unrelated to Kit—dark secrets from his past that he’s desperate to keep buried? Each possibility adds another layer of intrigue, and Lisa’s storyline has now become the center of speculation.

Social media has lit up with reactions to Lisa’s suspicions. One viewer tweeted, “Lisa Swain is about to expose DI Costello—I can feel it. Corrie hasn’t had a good corruption storyline in years, and this could be it!” Another fan posted, “Lisa is the only one sharp enough to notice Costello’s mistakes. I can’t wait for her to bring him down.” The anticipation speaks to how invested the audience has become in Lisa as a character. She’s not just a bystander—she’s a player, and people want to see her take on the big guns.

The stakes for Lisa couldn’t be higher. If she pushes too far, too fast, she risks being silenced, discredited, or worse. Yet if she doesn’t pursue her suspicions, Kit’s behavior may continue unchecked, and Costello’s potential secrets could cause even greater harm. It’s a delicate balancing act, and the tension lies in watching Lisa navigate it with her characteristic blend of courage and caution.

This storyline also reflects broader themes that resonate beyond the cobbles. In an era where authority figures are often scrutinized, Lisa’s growing doubts about her boss echo real-world concerns about power, accountability, and trust. Coronation Street has never shied away from mirroring society, and this plotline is no exception. By weaving in questions of corruption and hidden agendas, the show challenges viewers to consider what it means to hold people in power accountable, even when it’s risky.

As the weeks unfold, Lisa’s journey will be one to watch closely. Will she gather enough evidence to confront DI Costello head-on, or will she be forced to play a longer game, quietly chipping away at his façade until he slips again? And if she does uncover the truth, how explosive will the fallout be for Weatherfield? Whatever happens, it’s clear that Lisa Swain is on the brink of a storyline that could redefine her role on the Street and place her firmly at the heart of one of the year’s biggest revelations.

One thing is certain: secrets never stay hidden for long on Coronation Street. And with Lisa’s sharp instincts guiding her, it’s only a matter of time before the truth about DI Costello comes crashing into the light. The only question is whether Lisa will survive the storm that follows—or whether Costello, with all his power and influence, will find a way to silence her before she exposes him completely.