1935-E The Buzz Messengers

The twenty-third light novel of the Baccano! series is '1935-E The Buzz Messengers''. '''

Originally projected for a November 10, 2017 release, but since postponed. Dengeki Bunko has issued the following apology:

お詫び
2017年11月に刊行を予定しておりました電撃文庫『バッカーノ！1935-E The Buzz Messengers』は、製作上の都合により発売が延期となりました. お待ちいただいております読者の皆様には、深くお詫び申し上げます.

Ryohgo Narita has been experiencing joint problems, which he explained on October 06, 2017 were severe enough that they were interfering with work. In a follow-up tweet published on November 25, 2017, Narita has announced that his surgery was successful, but that recovery will slow down his writing process over the next few months.

Synopsis
Originally on the Dengeki Bunko website, has been taken down:

The casino party proceeds towards its climax and the fated third night. When everyone – including Firo, who is still worried about Ennis' kidnapping – gathers at the casino, the curtain rises on the final frenzied baccano–

Chapters
To be released.

Trivia

 * Ryohgo Narita referred to 1935-E as 1935 END & EPILOGUE in his afterword for 1935-D Luckstreet Boys. No reason for the change in title has been provided by either Narita or Dengeki Bunko.
 * The new title may be a reference to the jazz group The Jazz Messengers, following the trend of Baccano!'s novel titles paying homage to music bands.