When Kelsey and her friends find an abandoned pug puppy, it looks like another case for the Curious Cat Spy Club. But shortly thereafter, Kelsey's mother goes missing--possibly in the line of duty as an Animal Control officer--and it's up to the CCSC to discover what happened. As they search for Kelsey's mom, they start to wonder if her disappearance is somehow linked to the puppy they found. The fifth book in the Curious Cat Spy Club series is filled with twists and turns and, of course, tons of animal adventures!