That idea, as the final episodes of the second season reveal, revolved around Ian Reilly (Owen McDonnell), Grace’s ex-husband, and the idea that while Grace (Anne-Marie Duff) got some happiness after killing her cruel first husband, she couldn’t escape her own tragic cycle.

Though the beginning of Season 2 of Bad Sisters might have had viewers convinced that another dead body would be disposed of by the final episode, such was not the case this time around.

"It's on that knife edge, isn't it, of comic and absolutely psychotic," Shaw, 66, tells PEOPLE as she breaks down the show's eventful season 2 finale Warning: This story contains spoilers for the season 2 finale of Bad Sisters.