"Not Now, Bernard" is a children's picture book written and illustrated by David McKee. The story follows a young boy named Bernard who tries to get his parents' attention to warn them about a monster in the garden. However, his parents are too preoccupied to listen to him. As the story unfolds, the monster eventually enters the house, but when Bernard tries to tell his parents, they dismiss him again. The book explores themes of neglect and the importance of communication, making it a poignant read for both children and adults.