An unnamed Middle Eastern country is preparing to invade Europe. A small group of bright minds, trying to convince the European governments to arm for the coming war, find their members killed of one after the other. Next on the list is Tweed, who gathers his team of agents to find the killers, a group of mysterious women, led by the son of the Head of State of the unnamed Middle Eastern country.

Their journey takes them from England to Vienna, Zürich and Slovakia. As usual in Forbes's books, much time is spent in hotels and there's plenty of dialog, and Tweed and his team owe as much of their successes to luck as to skill. But there's also a fair share of action and despite its flaws (stilted dialog and plenty of clichés, and the pace could have been somewhat faster), "The Sisterhood" is an enjoyable, but not great, book.

They're back again! England's top SIS agents Tweed, Paula Grey and international foreign correspondent Bob Newman, along with ace sniper MArler and heavies Butler and Nield are facing a dangerous threat. Europe is under attack as various high ranking politicians seriously concerned with the lack of leadership and military spending in Europe are being taken out one by one. Tweed is on the list. Paula is almost kidnapped by Arab fundamentalists in Vienna. In Slovakia, Arab leader Hassan has made his residence and is planning a major military strike. Tanks and mechanised infantry are massing in Iraq. Tweed and his crew head for Geneva and then Austria on the train of HAssan and his professional female assassins, known as the Sisterhood. Not only that, one Emilio Vitorelli suspects English redhead Tina Langley is responsible for the death of his wife and is out for revenge, but just who can Tweed trust? Can they save Europe again?! Once again, Colin Forbes has delivered another gem of a novel which will keep you reading and entertained right to the end. Fast pacing, a good, steadily flowing narrative and well-researched locations contribute nicely to the interesting and rather plausible storyline.