A cat's loyalty is not easily earned. Yet Boo, a resourceful young feline with a keen eye and inquiring mind, has grown intensely devoted to her human companion, Carrie. But several days ago Carrie suddenly went away, leaving her family in disarray. Her husband, Tommy, is distant and distracted even as he does his best to care for Boo's human siblings, especially baby Finn. Boo worries who will fill her food dish, and provide a warm lap to nestle into. More pressing still, she's trying to uncover the complicated truth about why Carrie left.