With the mysterious arrival of a stolen diamond, a forensic investigator goes on a quest to Siberia to uncover a decades-old international crime linked to her lost family
There is a slight tone difference in her going or being sent. You can take advantage of that. “Quest” can police are a little disjointed. How does the arrival of the diamond connect and trigger her actions?
This may seem a lot to achieve but it sells the story.
I still have a problem seeing a clear and credible cause and effect relationship between the arrival of the diamond and the subsequent quest to Siberia. What is there about the arrival of the stolen diamond that triggers the character to go on the quest? It’s ‘mysterious’ — how can she deduce from an object shrouded in mystery that she’s got to go to Siberia to solve an old crime?
And what’s at stake in solving a decades old crime? What is the urgent import of a past event in the present life of the main character? Why must she solve the crime NOW — or else. Or else what?