Without spoiling the plot, Kaliszians: The Heir features:

Readers on Goodreads and Amazon frequently describe it as “steamy,” “passionate,” and yes—“hot.”

The keyword you provided blends:

This suggests the searcher is likely European (using “serie”) and wants a spicy sci-fi romance novel—book three in the Kaliszians saga.

You can purchase or read Kaliszians: The Heir on:

Searching “M.K. Eidem Kaliszians 3” or “The Heir M.K. Eidem” will yield correct results.