Title forgotten: thriller

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Title forgotten: thriller

1Jibrary
gen. 20, 9:35am

Hi, can you help me?
This book I've read is about this: A professor was kidnapped (and I think her name was Alex, but not sure), and someone else pretends to be her to attend a conference. There are accomplices, a young female pianist, her brother and her fiancé who is dominant (and they have other associates, who call each other with a code name), and they helped her at the reception of the conference. The motive of this woman pretending to be a professor is revenge. She targets a man at a conference. She takes a gun hidden in a bathroom to kill him. This man is the father of the pianist, and his company killed the family of this woman having now a gun with her. The police investigate this, and these young people have a hideout where they keep the real professor.
Do you know the title?