Martha Andersson may be seventy-nine years old and live in a retirement home, but that doesn’t mean she’s ready to stop enjoying life. So when the new management of Diamond House starts cutting corners to save money, Martha and her four closest friends — Brains, Rake, Christina, and Anna-Gretta (a.k.a. The League of Pensioners) —won’t stand for it. Fed up with early bedtimes and overcooked veggies, this group of feisty seniors sets out to regain their independence, improve their lot, and stand up for seniors everywhere.

Their solution? White-collar crime. What begins as a relatively straightforward robbery of a nearby luxury hotel quickly escalates into an unsolvable heist at the National Museum. With police baffled and the Mafia hot on its trail, the League of Pensioners has to stay one walker's length ahead if it's going to succeed...