Boston aired 9th July 2008 on Radio 4 and starred:
- Roger Allam as Douglas
- Benedict Cumberbatch as Martin
- Stephanie Cole as Carolyn
- John Finnemore as Arthur
- Ewen MacIntosh as Karl
- Kerry Shale as Mr. Leeman
- Matilda Zeigler as Shanwick ATC and Boston Paramedic
The opening for this episode is Carolyn giving a safety demonstration in her car,
The episode begins with Douglas and Martin playing a game of Simon Says in the flight deck, when Carolyn informs them that they've been hired to pick up a plane full of stranded American passengers from Luton Airport and fly them to Boston. Martin and Douglas try and argue the schedule, but Carolyn is set.
Once at Luton, Arthur tells Mr. Leeman to extinguish his cigarette, but he refuses until Carolyn comes over and extinguishes it. Martin and Douglas continue their game of Simon Says until the smoke alarm goes off. Carolyn reveals it's Mr. Leeman smoking in the toilets. Martin goes to confront him but Mr. Leeman insults Martin and sends him back to the flight deck, where he concocts a plan.
Next time Mr. Leeman enters the passenger toilet to smoke, Arthur opens the door and sprays Mr. Leeman with a fire extinguisher, giving Mr. Leeman a heart attack, Now stuck with a sick passenger, Martin and Carolyn butt heads over diverting to Reykjavik where he can get hospital treatment or press on for Boston. It causes problems with Martin and Douglas too, which results in GERTI being pinged around the Atlantic Ocean by Shanwick ATC,
The crew get medical help from Dr. Price, who reveals that Mr. Leeman died in the galley from his heart attack. Arthur reads his eulogy. it's decided that they press on for Boston. Once they arrive, Carolyn has problems with the Medical staff who tell her they should wait until tomorrow and they need to stay onboard GERTI until the coroners come to pick up Mr. Leeman. Martin decides to strong arm his way into the conversation and convinces the medics to take him.
At the security desk, Martin butts heads with a TSA agent over nasal clippers, informing him that there's a fire axe in the flight deck. Martin ignores Douglas' words about being strong arm just as he explains to TSA that he could crash the plane by pushing down on the control column, causing Martin to be arrested by the TSA under the Terrorism Act of 2002. Douglas and Arthur decide to go Duty Free shopping for Toblerones while Carolyn chases after the TSA agents and Martin.