A man wakes up one day to find he has been changed into a large insect/beetle. The story follows his efforts to deal with this, and his family's reaction to the change. But it's not just a story about a man turning into a beetle, it's a clever way of writing about how a family would deal with the main breadwinner in the house becoming unable to work, and also on a wider scope, the way a family (and the world at large) reacts to someone who is disabled, or terminally ill.
It could also be an analogy for how a family treats a member of the family who is now old and needs to be cared for. The man who is now a beetle, is forced to live in his room, shut away from the world, for fear that he will frighten anyone who enters the house.
The man who once provided for the family, and thought of them above himself, has now become a burden on them, as they are now short of money, and have to find employment. The once able and hard-working man, transformed into a beetle, is now rejected, and his family blame him for their financial situation and the fact that they cannot move to a smaller house, because they need to have a room to keep him in.
The descriptive quality of the writing is excellent, and although it is a sad and gruesome tale, it is also very funny in parts; I couldn't help laughing out loud a couple of times.
The main thing that struck me, was that even though this story is nearly 100 years old, it is still totally relevant to today's world (and I'm not sure that's something we should be proud of).