[PW] Book title of thriller novel about a Soviet scientist who fakes his own death

[Timothy Mukherjee]

Hello all,

I am trying to recall the title of a book I had read about 10 years ago. Here is what I can remember of the plot:

A British government official (or spy?) meets a young girl (named Peggy?) and soon they fall in love. He meets her father who is wealthy and seems very intelligent. Soon afterwards, the father dies and certain amazing secrets are unearthed during the investigation. The father is revealed to have been a Soviet mathematician/scientist who faked his own death and defected from the USSR to Britain around 30 years ago. His basement contains an elaborate toy train system, which is later revealed to have secret information hidden in the movements of the trains.

       
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