A 41-YEAR-OLD native of Monaco increasingly looks to be to banking what Edward Snowden is to American surveillance. In 2008 Hervé Falciani walked out of the Geneva branch of HSBC where he’d worked for three years, clutching five CD-Roms containing data on tens of thousands of account holders. The theft has lobbed a bomb into Europe’s private-banking market, spawning raids and tax-evasion investigations across the continent. In the latest, 90 Belgian agents swooped on the homes of two dozen HSBC clients this week, including several diamond dealers in Antwerp.Mr Falciani went on the run when the Swiss charged him with data theft. After moving to Spain he was jailed, but freed after a judge denied a Swiss extradition request. At one point, he claims, he was kidnapped by Mossad agents who wanted a peek at the client names. He has now taken refuge in France, where the government has offered him protection in return for assisting in its hunt for tax dodgers.