Finding a secret, hidden room in your best friend's new house sounds like the ultimate adventure, but for Zoey and Sassafras, it is just the beginning of a brand-new mystery. While exploring the mysterious space with Sophie, Zoey suddenly hears a strange noise that her friend completely misses. Could there be an invisible magical creature hiding right under their noses? When they finally discover the hidden source of the sound, they find a new magical friend suffering from a terrible, sneezy illness. You will have to grab your science journal and think like a real researcher to help Zoey test different ideas to cure this bizarre sickness. But the usual tricks are not working, and time is running out. Step into a world where science experiments and magical creatures collide, and see if you have what it takes to track down the clues, analyze the facts, and help Zoey save her new friend before the sneezes get totally out of control!