In this monograph, the author demonstrates that the Acts of the Apostles is a highly creative hypertextual reworking of the Letter to the Galatians, with over 500 strictly sequentially organized conceptual and linguistic correspondences between Acts and Galatians. This hypertextual dependence on Galatians explains numerous surprising features of Acts. Critical explanations of these features, which are offered in this monograph, ensure the reliability of the new solution to the problem of the relationship between Acts and the Pauline and post-Pauline letters.