Paco Arraia. The Death of the White Mouse

A retired intelligence officer, now a citizen of Finland living in Estonia, is asking for protection. Strange threats are coming her way: someone is leaving dead mice for the elderly lady. Special agent Paco Arraia rushes to help, arriving at the same time as high-ranking officials. And, as is often the case, a simple task turns into a deadly equation with several unknowns. And there isn't much time to solve it.
The fourth book in the "Secret Agent" series.