Nash Falls by David Baldacci

 This appears to be the start of a new series by David Baldacci, which I'm surmising because it ends with a cliffhanger. Walter Nash is a financial genius working for a company called Sybarite. On the day of his estranged father's funeral, Walter gets visited by an FBI agent who tells him there is all kinds of criminal activity (such as money laundering) being run through Sybarite and they want him to be a mole for the FBI. Soon a whole series of dominoes is falling, Walter is being accused of all sorts of crimes, and he has to go deep underground. It's quite the page-turner and I can't wait to see what happens next. Hopefully we won't have to wait too long.