The city of lost cats

"A feisty young girl named Fiona stumbles upon an old house, the middle of three abandoned mansions, full of stray (and runaway) cats (and two budgies). Naming it the City of Lost Cats, Fiona feels a great deal of sympathy for the animals; she understands wanting to run away. Ever since her parents died, she's been struggling to adjust to the new, smaller apartment she and her older sister, Tannis, now live in. Tannis has even less time to spare for Fiona, as her job at City Hall has her working more hours than ever. Cot (short for Cottonball Fluffikins Magnificent III, but he refused to answer to that name when he lived with his family) has lived in the house for two years and is the self-proclaimed leader of the cats. But lately, he's been worried about a challenge to his leadership. When a giant excavator rolls up to the houses, it's going to take some quick thinking on the part of Fiona, not to mention the cooperation of all the cats to give The City a future"--