Necessary Larceny / Ian Stout

Stand-out debut book of Ian Stout. Conned out of millions of dollars by slick fraud artists, the senior citizen victims are left impoverished and are too embarrassed to report the crime for fear younger relatives will deem them incompetent and remove what little control they still have over their lives.
Then, a hero emerges with a plan, a sting operation is launched to recover the stolen funds and the Necessary Larceny adventure begins.