Revisiting old ideas isn’t always great. Some ideas stay ideas for a reason: too thin, too odd, too vague. Sometimes you can trace your own development from a poor idea to a much better one further down the line: familiar characters, a joke too good to lose, a villainous name. So not all of your work was wasted. It’s arguable that no written work is ever wasted. Every bit of it sharpens your pen, focuses your thoughts. An idea doesn’t have to end in a finished book to have been worth your while.
The old idea that I have been revisiting doesn’t seem to have cast a shadow on later books or concepts. I think because it was an idea complete in itself. Re-reading it four years on has excited me. The concept is good. Solid. Worth saving, I think. But what it lacks – something I couldn’t see four years ago when I was blinded by my own overinflated sense of genius – is heart.
Heart lies with character. Pull that apart, rebuild it from the heart upwards. If it is rooted inside a structure that you think still works, you could rekindle an old flame.