After working in the Underworld Realm for ten years following her death, Wren Wilde receives her final assignment right before reincarnation: processing her ex-husband Lucian Lowe and his wife. A decade of old love and hatred surges back, but she only wants to drink the Forgetfulness Elixir and completely sever ties with her past. However, a mysterious Rebloom Blossom suddenly triggers unrest in the Underworld Realm, dragging Wren, Lucian Lowe and Jasper Sterling into a forgotten past life.