We Didn't Mean to Go to Sea - Oxford Bookworms 4

The children of the four Walker families were not going to go out to sea. He had promised his mother that he would stay at the port to avoid danger and that he would be home by Friday's tea time. But this time they are drifting in a thick fog on someone else's boat. When the fog clears, you can turn around and return to the port, but then a storm will sweep you far into the cold northern seas...