This article contains spoilers for tonight’s Coronation Street, which has not yet aired on TV but is available to watch now on ITVX.

DC Kit Green (Jacob Roberts) has clearly been up to something in Coronation Street of late, and it appears to have something to do with his boss, DI Costello.

Earlier this week, DS Lisa Swain (Vicky Myers) grew suspicious after overhearing Kit on the phone. Once his back was turned, she did some detective work of her own and discovered that her colleague had noted an unfamiliar phone number down alongside the DI’s name.

When she asked him whether he had a new phone, Costello denied it, before questioning her relationship with Kit and warning her to keep it professional as he didn’t want to see her dragged down with him.

Of course, this left Lisa even more suspicious, though when she tried to quiz Kit, he gave nothing away.

Their conversation was interrupted by Kit’s phone ringing, with the detective being called into the station.

It quickly transpired that Eli, Sarah Platt’s (Tina O’Brien) client, had filed a harassment complaint against him, and he and Costello needed to discuss it.

However, Kit’s guard was raised when Costello let him off relatively lightly, dropping the matter and relegating him to desk duty, insisting that Kit tell anyone who asked that it was because of his injuries.

Ever observant, Lisa didn’t buy the excuse and told Kit that if he was having issues with Costello then she could help.

He brushed her off, insisting that he was simply injured, though it was clear she wasn’t convinced.

Later, Kit finally admitted that he was suspicious of Costello’s motives, pointing out that he usually came down hard on his coppers instead of letting them off easy.

As Kit pondered this, Lisa took the opportunity to question why he had tried to access Becky Swain’s files.

Viewers will know that Lisa’s late wife was also police, and was under investigation for corruption when she was killed in the line of duty.

When Lisa went looking for more information, she was caught red-handed by Costello himself, who assured her that there was nothing to find, as the case against Becky had been dropped.

However, Lisa had found something – a request for the files from her colleague.

Though Kit told Lisa to stop snooping, he later confessed to Sarah that he had been investigating a case that had links to an historic case involving Becky.

However, when Costello demanded that he leave the case well alone, Kit continued to investigate in secret – and he may have found something.

When Kit was later called into Costello’s office, the boss told him that he was ‘a man of integrity with nothing to hide’ and Kit should be careful what he says.

Undeterred, Kit retorted that that ‘wasn’t strictly true’…