A Whisp of Memory

This is an Apple Books audiobook narrated by a digital voice based on a human narrator.

You awaken one morning and remember nothing. Not your name, not who you are, not where you are, nothing at all. But you've awoken in a bedroom which is yours, in a large house which you apparently own. You have several servants in your employee, but you don't speak their language, nor read their written words. But you do possess one unique skill. If you hold a lump of coal in your hand, and vent all of your angry frustration into the coal, it turns into a beautiful diamond worth millions.
Over time, years, decades, you slowly begin to recover your memory, but as soon as it seems you're just within reach of some answers, you fall ill, and forget everything again. But, marooned in a culture where the epitome of technology is square rigged sailing ships and horse-drawn carriages, how is it that you know about TV, radio, lasers and plasma jet engines. Why isn't this culture progressing, advancing? And oh yes, why aren't you aging?
Your most common answer is 'I don't know', and your favorite question is 'what the hell is going on'? But you will only find out the answers if you can learn to remember. Otherwise you're going to be stuck on this world for a long, long time.