In series four, Nick (David Giuntoli) finds it difficult to adapt to the loss of his powers until Captain Renard's (Sasha Roiz) mother Elizabeth (Louise Lombard), finds a way to restore them. Wu (Reggie Lee) grows weary of Trubel (Jacqueline Toboni) after finding her Grimm Diaries. Monroe (Silas Weir Mitchell) and Rosalee's (Bree Turner) marriage doesn't sit well with the Wesensein and Juliette (Bitsie Tulloch) undertakes an unexpected transformation.