Lamb told the Daily Star that the pair will argue over the loss of Ronnie's baby when she was just 14, culminating in Archie ripping off Ronnie's keep-sake locket for her daughter.
"Ronnie brings out the worst in Archie, and he gets vicious. Archie wants to put right these long-standing problems he has with Ronnie. But things just get worse," Lamb said.
A soap insider added that viewers will witness a "spectacular war" between the two.
"At the moment she has to play the game to get what she wants. But she is more than a match for Archie - and with Phil as back-up she is able to take him on. And one thing is for sure - it's going to be a spectacular war between these two," the source said.
> Janus: 'Ronnie's about to tailspin'