The judge carrying out the high-profile investigation into the Bettencourt affair involving France's wealthiest woman, allegations of financial abuse and claims of political corruption at the highest levels, has ordered three allies of former President Nicolas Sarkozy to be questioned as witnesses. Judge Jean-Michel Gentil, who is said to be close to completing his mammoth task, is examining whether L'Oréal heiress Liliane Bettencourt's mental frailty was taken advantage of by those around her. But the publicity-shy judge is also investigating claims that the billionaire’s money was illegally used to fund Sarkozy's 2007 election campaign. There are also allegations that the Elysée Palace tried to stop a proper investigation into the affair and that France's domestic spy chief himself became involved. As Michel Deléan reports, the judge is leaving no stone unturned in his inquiries.