Simply fill in the blanks of this diminutive volume and voilà: it becomes a personalized gift someone you miss will read again and again. Make it as longing, lovey-dovey, or lol-y as you please! Hardcover with removable clear plastic jacket; 4.5 × 3.25 inches; 112 pages. Knock Knock is an independent maker of clever gifts, books, and whatever else they can think up; their mission is to bring humor, creativity, and smarts to everyday life.