[s4e5] Eye Of - The Beholder

The crime involves professional robbery equipment and a series of "dirty tricks". The detectives eventually discover that the murder and theft were tied to a bitter divorce battle between the sculpture's wealthy owners.

Serena successfully helps recover the artwork, though her presence highlights the growing (and jealous) chemistry between Castle and Beckett. "Castle" Eye of the Beholder (TV Episode 2011) - IMDb [S4E5] Eye of the Beholder

Serena’s involvement creates immediate tension. While Castle is intrigued by her "reformed thief" expertise and charm, Beckett is highly skeptical of her theories and legal status. The crime involves professional robbery equipment and a

The investigation introduces Serena Kaye (played by Kristin Lehman), a smart and attractive insurance investigator who specializes in recovering stolen art. [S4E5] Eye of the Beholder