Obsession and Madness

Mrs. Wallis's obsessive love for Sorrell drives her to murder, and her 'fair-minded' confession despite her madness raises questions about sanity, while Grant's own obsessive focus on the case nearly leads him to resign.

Grant's relentless pursuit and the Levantine's irrational flight into traffic suggest obsessive and desperate behavior.

Grant's obsessive pursuit of clues, working through Sunday, and his surreal dream reflecting his fixation on the case.

Grant's thoughts become consumed by the case, recognizing it as an obsession that he resents but cannot escape.

Grant's persistent unease and determination to uncover the truth borders on obsession, as he pursues a hunch against Barker's advice.