Firefly gadroon - Jonathan Gash

I don't like to pack too much into an ordinary day and this one had already been pretty eventful - two arguments with women, a fight in a pub, a warning from the Old Bill and a fiasco at auction that lost me an exquisite antique Japanese firefly cage. The trouble was, somebody wanted that little gem even more than I did. It was the key that would unlock a secret they'd to anything to keep under wraps, even murder.
If only they could only have gone about their dirty deeds without involving me or my friends, they might have got away with it all, but when the master craftsman bravely trying to teach me the art of gadrooning fell foul of them and paid for it with his life, they had me to deal with . . .