The Lighthouse Keeper's Rescue

After The Lighthouse Keeper's Lunch (the book that launched a thousand infant technology projects) and The Lighthouse Keeper's Catastrophe, this book seems to me to prove the law of diminishing returns. It is, certainly, a perfectly serviceable story about the time when the Lighthouse Keeper faces the sack for falling asleep on the job, but the ending is contrived and the prose flat. It has none of the logicality and lateral thinking of the lunch story and none of the suspense of the catastrophe. This makes it rather ordinary. Perhaps the Lighthouse Keeper should be retired, after all.