The Secret Houses — John E. Gardner

The second volume in The Secret Generations Trilogy

Set between the final months of World War II and the beginning of the Cold War, The Secret Houses continues the saga of two families, the Railtons in Britain and the Farthings in America, intertwined in the secret world of Intelligence by blood, love, loyalty and betrayal. Both families are concerned in the fate of the Tarot resistance network, operated by Caspar Railton under the nose of SS officer Hans-Dieter Klaubert, for Caspar had recruited his nieces Caroline and Jo-Jo as undercover agents in France, and their disappearance coincided with the break-up of Tarot.