Showing Something Dangerous by Penny Vincenzi

The dazzling Lytton twins, Adele and Venetia, are born into the great Lytton publishing empire. In 1928, on their eighteenth birthday, they are rich and admired, with a confidence verging on arrogance. But the spectre of Nazi Germany is growing...

Gradually their privileged world darkens in unimaginable ways - but it is not just the twins whose lives have been irrevocably changed. Barty Miller, rescued from the London slums in babyhood by Celia Lytton, is clever, ambitious, and a complete contrast to the twins - and she faces temptation of the most unexpected kind...