Sowerbutt's Egg

Polly said: "The repository is a good business. We’re accumulating quite an art collection. You’ll never guess what turned up the other day.” Sowerbutt shrugged his shoulders. “A Faberge egg. Remember the Russian emperor, or whatever he was, had them.”

http://www.amazon.co.uk/Colour-Smoke-London-Sowerbutt-Novels-ebook-x/dp/B00RYR8BWG