After a local couple's path to the altar is sabotaged, retired spy Irma Abercrombie and sun-deprived nerd Violet Blackheart get roped into sorting out the duo's wedding woes—and all the bodies.

Meanwhile, Violet preps for her business partner's island arrival—blender drinks at the ready—as Irma secretly tries to track down Violet's former CFO...and their company's former money. Along the way, Irma decides to mix business with pleasure, but struggles to sort out the rules for septuagenarian singletons who are looking for a bit of romance in between solving crimes.

With her trusty telescoping mirror and adorable (if untrainable) canine companion Mr. P, and nerdy sidekick Violet Blackheart, Irma sets out to save a wedding, retrieve Violet's fortune, and find a killer.