“Curiosity House: The Shrunken Head Book” by Lauren Oliver and H.C. Chester

The description on the front cover reads: “this book is about, among other things: the strongest boy in the world, a talking cockatoo, a faulty mind, reader, a beautifully bearded lady and a nervous magician, an old museum, and a shrunken head!” Fantastic mystery for ages 8 to 12 years old.