Why read this explainer
Keep the endings distinct before comparing Marlowe's loyalty to Terry. Chandler's detective rejects him, while Altman's 1970s reworking makes that response a killing.

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Book to movie
Philip Marlowe protects his friend Terry Lennox, then follows connected deaths and deceptions until loyalty becomes harder to defend than the truth.
Verified facts
Why read this explainer
Keep the endings distinct before comparing Marlowe's loyalty to Terry. Chandler's detective rejects him, while Altman's 1970s reworking makes that response a killing.
PlotGeeks note
The period change and comic drift sharpen the final limit on Marlowe's tolerance. Shooting Terry replaces the novel's rejection with an irreversible response to betrayal.
At a glance
Closer comparison
Marlowe's voice gives the complex case a firm moral and stylistic center.
The detective seems out of time, surrounded by people who treat loyalty as an obsolete habit.
The Wade investigation, Lennox mystery, and institutional protection form a dense explanatory chain.
The story drifts among encounters before revealing how money and betrayal connect them.
Marlowe rejects Terry after discovering the deception but does not kill him.
Marlowe shoots Terry, making betrayal the line his private code will not absorb.
Source to screen
Marlowe's voice gives the complex case a firm moral and stylistic center. The detective seems out of time, surrounded by people who treat loyalty as an obsolete habit.[1][2]
Marlowe rejects Terry after discovering the deception but does not kill him. Marlowe shoots Terry, making betrayal the line his private code will not absorb.[1][2]
Sources
Sources for the book, film, and adaptation relationship are listed below. The comparison notes are original PlotGeeks prose.