A

rthur Holmstrom, recently chair-promoted treasurer of the local, Freemason-style charitable Monarch Lodge, is knife-murdered in his club HQ office. Detective Lassiter, a member, and president Irving Parker, his soon-ex's father, ask Shawn and his unamused father Henry, a former member, to solve the case discretely. Gus enjoys approaching the exclusive membership, including many prospective medical clients, and thus contributes suspicious observations to a plot of black books and deadly ambition.

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