#2 in the Doc Adams series.
Doc Adams series - Narrator-sleuth ""Doc"" gets into the act this time when he hires super-courier Johnny Robinson to deliver some expensive dental work. . . which never arrives: Doc and his brother-in-law Joe Brindelli (the food-obsessed cop) go looking for Johnny, who's dead (from lethal gas) in his Lowell, Mass., apartment. Why was the messenger killed? Was it because he was also delivering some secret documents about the Sacco-Vanzetti case? So it seems--especially when the owner of those documents also turns up dead. And the killer seems to be a Mafioso hitman. . . but hired by whom? By Italian-Americans afraid that Sacco and Vanzetti will be proven guilty by those documents? Or by someone who doesn't want their innocence proven? The answer lies in the missing microfilm--which Doc keeps looking for (while being shot at and otherwise roughed up).