Llama's single-minded pursuit of delicious desserts reaches new frontiers. This third installment in the series finds Llama obsessing over the "spectacular" doughnut with extra sprinkles he ate at his birthday party yesterday. If only he could eat it again! The "rational llama of science" sets out to do exactly that. But when his new time-travel pants take him further back in time than expected, Llama finds (and eats) a different birthday doughnut, unknowingly altering the space-time continuum for his younger self. Baby Llama's sad, lonely birthday "Long, Long Ago" without sweets--or friends to share them with--offers sympathetic context for Llama's present-day hoarding tendencies and distrust of strangers. Both are on full display after Baby Llama and a host of other creatures from the past and present follow Llama back to his "Today" and start to destroy his home--what if his secret cake cellar is next? But when he and Baby Llama rush to protect the desserts, Llama realizes what his younger self wants even more than sweets. Tight narrative pacing, well-timed instances of onomatopoeia, and expressive, cartoonish illustrations make this an engaging read-aloud. While the narrator seems to take a dark pleasure in describing the consequences of Llama's inability to read instructions, follow rules, or predict the consequences of his own actions ("he would pay dearly for it"), the cautionary tale elements are tempered by a reassuringly positive outcome for all llamas involved. (This book was reviewed digitally.) As silly (and sweet) as a basement full of cake, with a hint more substance. (Picture book. 3-8) Copyright (c) Kirkus Reviews, used with permission.