This is a Newberry Honor Book I have never heard of. It is appropriate for ages 7 and up.
The plot summary is that Ronnie and Aunt Martha are asked by the lighthouse keeper at Tern Rock to take care of the lighthouse while he goes to visit family. Ronnie hesitates because it is near Christmas and he is afraid of missing Christmas with his family.
Older readers may be able to guess the outcome. However, I understand why this book received the Newberry Honor. The plot is very tight, characters well-described, and the language is middle to high school level. There is a great lesson taught as well.
Find a copy and read it especially if you have older children.