Zara is a young inventor with a cardboard lab, a toolbox full of ideas, and a very curious cat named Momo. One day, while testing her new snack dispenser, something unexpected happens—Momo disappears!

But he's not lost. He's invisible.

Zara soon discovers her machine is actually an invisibility whistle—and it works! From wild experiments to a school talent show and a disappearing disaster in her garage lab, Zara must learn how to control her invention before things go completely invisible... forever.

Perfect for fans of Ada Twist, Scientist and Zoey and Sassafras, this funny, heartwarming early chapter book blends science, imagination, and adorable pet chaos into one unforgettable story.