The Black Ice Score

Parker takes on a secondary role in The Black Ice Score (book #11 in the series), as a gang of amateurs plot a heist to retrieve stolen African diamonds; it is only when his girlfriend Claire is kidnapped that Parker gets drawn in to the job. The zany plot is a little incongruous with Parker's seriousness, but Stark/Westlake has some great lines: "The older man turned his head and studied Parker tiredly and suspiciously. His manner was that of a sage that people don't come to any more."