A German spy is passing on information about the location of Allied ships in the neutral harbor of Goa, India, with catastrophic results. Unable to undertake a full military operation in the Portuguese stronghold, English intelligence brings out of retirement a crew of geriatric ex-soldiers (Gregory Peck, Roger Moore, David Niven), veterans from World War I, using their age as cover. These old soldiers are asked to take to the seas and pull off an unlikely undercover mission.