The Book of Acts is a transition book. From Kingdom a believers to a Body of Believers. From Law to Grace. From the 12 Apostles dealing with Israel to one Apostle dealing with the one new man, where there is no difference between Jew and Gentile. No one “Laid down his pen”, and the story does not just “abruptly end”. The dispensation of the law was set aside and the dispensation of the grace of God was taken up. Acts is about the fall and temporary blindness of Israel. And the times of the Gentiles. Just like Hebrews is a transition Book, where God is once again dealing with Israel as a nation and the middle wall of partition that separated Jews and Gentiles is back up.
In terms of its human actors, as a story, “Acts” reads not as a “history,” but a commentary on events. On the issue of Peter, of course, the reformers felt the need to “debunk” the story of his death in Rome. The Reformation began as a repudiation of Roman authority, and so claimed that there being nothing written in the New Testament about his presence in Rome, and the Bible being a complete substitute for Church authority, the claim that Peter was buried in Rome was false. With Jerusalem in the hands of the Muslims, Rome had become the greatest of pilgrimage sites, St, Peter’s basilica being the grandest. That was one source of the pope’s power.
It was noted by a Theology professor I studied under that actually Acts is actually the first NT book..the gospels all reflect the the OT law,which Christ fulfilled and that was eliminated at the cross when the new covenant was made ...
Thats why so many get confused, and think that law keeping is a means of salvation today ..