Readalikes 
If you liked 54, try these:
Absolute Friends
by John Le Carre
An epic tale of loyalty and betrayal set in the West Berlin of the 1960s through to the present day of terrorism and new alliances.
Brandenburg Gate
by Henry Porter
Set in the weeks before the fall of the Berlin Wall, Dr. Rudi Rosenharte, formerly a Stasi foreign agent, is sent to Trieste to rendezvous with his old lover and agent, Annalise Schering. The problem: Rudi knows shes dead.
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