Robert Walker as Bruno was excellent. He had elegance and humor, and the proper fondness for his mother.

In this quote, Patricia Highsmith is praising the performance of Robert Walker in his portrayal of the character Bruno in the film adaptation of her novel Strangers on a Train. Highsmith commends Walker for bringing an essential combination of elegance, humor, and an appropriate fondness for his mother to the role, which she believes made his portrayal of Bruno effective and memorable. These qualities help define Bruno as a complex character with both charm and an unsettling edge.

Highsmith’s mention of elegance and humor highlights the sophistication and wit that Walker brought to the role, which made the character more dynamic and engaging. Elegance suggests a level of refinement, while humor adds a layer of unpredictability to Bruno’s personality. This balance between charm and menace is a crucial aspect of the character, and Walker’s ability to embody both traits is central to his success in the role.

The reference to Bruno's fondness for his mother adds depth to the character, showing that he is not just a villain but someone with personal attachments and complex emotions. This relationship humanizes him to some extent, making him more than just a one-dimensional antagonist. Highsmith’s comment underscores the skill with which Walker portrayed these multifaceted aspects of Bruno’s character.

Ultimately, Patricia Highsmith’s quote praises Robert Walker’s performance in the film for its ability to blend sophistication, charm, and dark humor, while also giving the character a deeper emotional connection. This evaluation highlights how Walker's portrayal contributed to making Bruno a memorable and compelling character in both the book and the film adaptation.