Coronation Street delves into Lisa Swain’s past tonight, as it’s revealed that she had an explosive row with her late wife Becky on the day that she died.

Lisa shares the upsetting details with her partner Carla Connor after being caught out for acting strangely around some old files.

When Lisa looks through some old boxes, wanting to distract herself on the day of Craig Tinker’s memorial event, she overreacts as her daughter Betsy goes snooping through them.

Of course, this only piques the curiosity of both Carla and Betsy, who want to know what she’s hiding.

Initially, Lisa makes out that the files relate to Betsy’s paternity, which she can’t know about until she turns 18.

However, once alone with Carla, a sheepish Lisa admits that she didn’t want Betsy to find a letter relating to an investigation that was carried out into Becky’s police work before she was killed.

Lisa recalls: “When Becky died, she was being investigated for corruption. She didn’t even tell me about the letter – I found it at work.

“The thought that I’d even doubted her, even just for a second, it broke something in us. We’d been walking on eggshells for days and it was awful.

“She walked out, ignored my calls, and then that was it. She died that night – hating my guts.”

The investigation into Becky was later dropped, but her bosses in the police spitefully took a low-key approach to her send-off – meaning that she didn’t get the funeral she deserved.

As Betsy also reads the letter, she becomes determined to get proper answers over what really happened before Becky died.

This leads to a return appearance from villainous Logan Radcliffe, as Betsy pays him a visit in prison this Friday (13 June) to see if he can shed any light on the situation…