The Tightrope Men
Desmond Bagley
 Giles Denison's life is turned upside down when he awakes to find himself in a luxurious hotel in Oslo and, peering into the bathroom mirror, discovers the face of another man. He has been kidnapped from his flat in London and transformed into the likeness of a Finnish scientist, Dr Harold Feltham Meyrick. Compelled to adjust to his new persona (including meeting his daughter) and to play out the role assigned to him by his captors, the group embark on a dangerous escapade from Norway to Finland and across the border into Soviet Russia.