Lewis is currently showing genuine concern for Gloria (Sue Johnston) after she informed him that she is terminally ill, but her false claims are all part of a scheme to test his loyalty to Audrey Roberts (Sue Nicholls).
Egged on by Audrey's daughter Gail (Helen Worth), Gloria is trying to determine whether she can tempt Lewis to agree to run away with her.
Havers told itv.com of the storyline: "Gloria has told me she's dying, and of course being actually quite a nice guy underneath it all, I'm looking after her. I can't tell Audrey I'm doing that, because she'd get hacked off.
"Well, it turns out that Gloria has been lying to me so I'm a conman who's being conned! And if a conman gets conned, he gets really cross."
When Audrey discovers what Gloria and Gail are up to, she decides to let them proceed with their scheme - also intrigued to discover whether she can really trust Lewis.
However, when Lewis approaches Gloria's family with the 'news' that she is dying, her deceit is soon exposed to all.
Discussing whether Lewis is angry, Havers remarked: "Well yes, and I think rightly - and I would be. Not Lewis, Nigel Havers - I'd be hacked off!
"He confronts Audrey, and I think he's considering doing something fairly drastic there. I'm not sure what - I don't know myself what happens.
"This may well be the end of Audrey and Lewis. But you don't know, because you don't know what happens on Coronation Street. Watch this space."
Coronation Street airs the storyline all this week on ITV1.