After penning a letter in support of Meredith during the trial concerning her medical licence, Cristina makes another offscreen appearance to give her "person" a gift for her first day back to Grey Sloan Memorial Hospital. While Meredith puzzles over the mystery, she clashes with the new chief of pediatric surgery, Cormac Hayes, over the care of a 13-year-old patient with a tumor. After Meredith shows Cormac that he's "just a guest in her house" and saves her patient from a gallstone, Christina sends her a message that the package she sent isn't an it, it's "McWidow." Looks like Cormac, who reveals his wife died right before Christina sends the message, is going to stir up trouble between Meredith and DeLuca.