In Acts 23:12-22, Paul is imprisoned in Jerusalem, when a group of over 40 young men take an oath not to eat until they have killed him. They plan to request him to be taken for an audience at the Sanhedrin, and to ambush it en route. Paul's nephew hears of the plot, tips off the military commander, and Paul is extricated at night to Caesarea to foil their plot.
A little more from David Gooding’s book, True to the Faith.
Why is the section from Acts 19:21-28:31 so long, taking about a third of the book?
Because on trial is not just the question of whether Paul took a Gentile into the temple, but the gospel itself, and Paul as apostle to the Gentiles.
I have long found David Gooding's book, True to the Faith, a really helpful look at the book of Acts, mapping out how Luke's story unfolds and how it teaches us in the process.
As I look at chapters 19-28, he introduces his section on this with the following really helpful paragraph (page 338 in my 1990 edition; I'm not sure how much material has been added by the currently in-print 2013 edition to move the page numbers on):
Drupal no longer releases a new version of Core when an upstream dependency fixes a security vulnerability. It is the responsibility of site maintainers to keep track of security advisories for all such dependent libraries. That is no small task, and a way to automate this is needed. This post looks into how this can be done.