What in the world is Robin going to do with the baby she finds in her sandbox?

"Murmel, murmel, murmel," is all Robin hears coming from a hole in her sandbox. When she reaches down and out pops a baby, she finds herself in a real fix: who will take care of it? Robin's too little! Off she goes, searching her neighborhood for someone who needs a baby. The woman with seventeen cats doesn't want the baby. Nor does the grumpy man by the bus stop. It looks as though all hope is lost, until a friendly truck driver passes by. He offers to trade his truck for the baby—an exchange Robin can't refuse.