Billy was on holiday last year on the island of Delzzup.
Delzzup is a really peculiar shape for an island, it's rectangular, 20 miles long and only 15 feet wide, and totally covered in trees!
It has two tiny villages on it Start and End, unfortunately, a fire has begun at Start and is travelling toward End at around 1 mile per hour.
There is also a wind which is blowing towards End at around 2 miles per hour.
Now, Billy, who is at End, has no way of getting off the island, he cannot pass through the fire, he cannot put the fire out and there is no one to help him.
How can he save himself?