The National Rifle Association is being sued. The nonprofit at the heart of the gun lobby is accused of diverting money from its charitable mission. NPR investigative journalist Tim Mak has been following the paper trail, much of it tracing back to Wayne LaPierre, longtime leader of the NRA. NPR's Steve Inskeep talked with Mak about his new book, Misfire, detailing congressional investigations, and what the New York state attorney general has identified as tens of millions of dollars of corrupt spending on private jets and six figure suits.