The vorpal blade - Colin Forbes

This novel differs from its recent predecessors. It is a sensational crime thriller. Tweed has to revert  to his one-time role of Homicide Superintendent at the Yard. His investigation into a number of horrific murders sweeps him from Bray in Britain to Maine in the US, and then back to Europe to Montreux, Zurich, Lugano in Switzerland, accompanied by his usual team - he is still Deputy Director of the SIS.

His roles combines. He realizes enormous power behind the systematic massacre. Russell Straub, Vice President, expected to be the next US president, continues to dog the footsteps of the strange Arbogast family. Why?

This is weird Roman Arbogast, creator of a world conglomerate; his daughter Sophie, volatile scientist; Marienetta, his brilliant, captivating niece. Tweed's investigation is hampered by pressure from the British and American governments. What terrible secret are they concealing? 

Tweed encounters unbalanced playboy Black Jack Diamond; the Roumanian Elena Brucan, sensitive to evil; criminologist Abraham Seale; Sam Snyder, unscrupulous journalist. Some will be victims of the dreaded Vorpal Blade.

But it is shrewd, stubborn Paula Grey, risking her life, who eventually tracks down the wielder of the blade. By herself, underground in a remote mountainous zone.