Jack, Tess and Sam are undercover in Portugal on a mission to find the saboteur scuppering Team GB's Olympians. When Mr Brown spots his ex-wife at the airport he realises that MI6 are also on the case. Determined to beat MI6, he rashly imprisons the Vice President of the International Olympic Committee. Can Jack and his friends catch the saboteur, save Downing Street and save their teacher from kidnapping charges? And, as the mission progresses, the question becomes: can they save themselves?