The Flowers of Vashnoi by Lois McMaster Bujold

Still new to her duties as Lady Vorkosigan, Ekaterin is working together with expatriate scientist Enrique Borgos on a radical scheme to recover the lands of the Vashnoi exclusion zone, lingering radioactive legacy of the Cetagandan invasion of the planet Barrayar. When Enrique's experimental bioengineered creatures go missing, the pair discover that the zone still conceals deadly old secrets. This novella falls after Captain Vorpatril's Alliance in the Vorkosigan series timeline, but may be read entirely independently. The Vorkosigan saga was the recipient of the first Hugo Award for best science fiction series in 2017.