Meredith and Addison have an affair while the redhead is still married to Derek.

Part 2 of Death's Echo. Death had always given peace, silently guiding souls to the release they craved, though it was a gift meant only for mortals. For eternity, she carried out her duty, untouched by the solace she granted-until she met Agatha Harkness. Agatha's soul burned brighter than any other, drawing Death in with her power and complexity. Curiosity turned to connection, and in Agatha, Death found something she never thought possible: love, and with it, peace. But when Agatha died, that peace vanished. And she wanted it back.

When Rio joined Agatha on the witches' road, she wasn't scared. If anything, she was cocky. The idea of walking the witches' road with her wife again felt like an adventure-an opportunity to be by Agatha's side, even if Agatha clearly didn't want her there. Rio thought it would be fun, familiar, despite the trials ahead. She had convinced herself nothing could touch her. But when the second trial arrived, everything changed. Rio found herself standing on the porch of the only home she had ever known-the home she shared with Agatha and their son, Nicholas. The witches' road was ancient, as old as she was, and it had reached into her mind, plucked her deepest fear from the darkness she refused to acknowledge. It wasn't a monster or some forgotten villain. It was a memory. The memory of the day she lost everything. And in that moment, standing on that porch, Rio realized the truth: for all her bravado, the witches' road knew exactly how to break her. Because the one thing Rio feared more than anything was reliving the day her world shattered.