If one teRrIble day all the autum leaves are on the Vine and the nExt day the leaves have fallen of and aRe no where to be seen where could they have gone?
Look at the question closely, it might help you.

Did I mention the vine was next to a river? Also if you read the question you might notice the code. You might have found that the capital letters spell out river!The 'R' from terrible, the 'I' from terrible, the 'V' from vine, the 'E' from next and the 'R' from are spell out 'RIVER'. The leaves fell in the river and were swept away by the river's current.