"Michael has been getting into trouble lately. As a consequence, his mom is making him look after his grandfather for the summer. The thing is, Gramps isn't your average senior citizen: he's a retired burglar with a lifetime of criminal knowledge. When a thief breaks into Gramps' apartment and steals a necklace with great sentimental value, the unlikely pair team up, combining old-school planning and modern tech to track down the necklace--and try to steal it back"-- Publisher's website.