Rating: WARTY!
This is from an advance review copy for which I thank the publisher.
This is a young children's book which seems to convey the message that it's just fine for a young kid to go out by himself, meet a stranger, wander off with the stranger without saying a word to mommy, spend hours gone, and then come back and offer no explanation. I felt it was entirely inappropriate and the wrong message to send to kids.
The child in question wants to go out and play on his bike, and the poster parent for bad parenting, who is the kid's mom, lets him out on the street with no supervision and no safety gear such as a helmet or elbow/knee pads. He sees some weird giant creature which is riding a bike and so he follows this creature, which then teaches the kid to ride without his safety wheels.
He does give the kid a helmet, but this is an afterthought and indicates that it's okay to accept gifts from complete strangers. I'm sorry but there are far better ways of achieving the end here than teaching a kid that it's fine to do the things depicted here with someone you don't know and to wander off with a stranger without a word to mom or dad. There are far better ways to have written this, and I cannot approve of this book at all.