Like a ghost story or a mystery of memories, a new film with a dementia-plagued protagonist puts viewers smack dab in the middle of his deteriorating mind. Florian Zeller’s handsomely produced and occasionally frustrating The Father (B) takes place primarily in an impeccable flat, and the denizens there are going through rapid melancholy decline and hunkering deeper and deeper behind closed doors. The film depicts a complex Anthony Hopkins who rationalizes the activities and relationships in his life even as his faculties are escaping him. Olivia Colman is moving as the most prominent of the characters surrounding the charming Englishman: a frustrated daughter and caregiver who becomes an engaging foil to the titular subject. Hopkins gives a devastating and forceful performance as a man who feels the rug is consistently pulled out from under him. It’s quite an impressive role and portrayal. The viewers see other characters as he does, sometimes shape-shifting or reacting with confounding responses. It’s a smart drama, well acted; and what it lacks in plot momentum or story immediacy, it makes up in quietly observed intimacy.