After his elderly owner is injured in an accident, Buster the cat gets lost, and a young neighbor sets out to find him.
Buster spent his early months at the Rainbow Street Shelter, also the name of this pet-focused series for readers who have recently made the transition to chapter books. Finally adopted by Mr. Larsen, he loves their life together. Josh, a grade-schooler, is trying to deal with his grief over the death of his pet rabbit when Buster goes missing. Aided by his parents, Josh begins a determined search for the missing pet. Just as in the first work in the series (Lost! A Dog Called Bear, 2011), this effort sympathetically, if briefly, deals with some complex issues, including the responsibilities of pet ownership, death and aging, but always within the framework of an optimistic, childlike perspective appropriate for the target audience. Readers will fully understand that although Josh's focus on finding Buster is at first driven by his own loss, later he genuinely falls in love with the wily cat. Several characters that appeared in the first work in this series make cameo appearances, providing continuity. Attractive black-and-white full- and half-page sketches, one or two per chapter, offer some visual interest as well.
This early chapter book with plenty of heart and a bit of suspense will appeal to young pet lovers. (Fiction. 6-9)