For several decades, the close relationship between the United States and Europe has been a key aspect of international politics. But what are the sources of the endurance and resilience of transatlantic ties? This question preoccupies researchers, and its salience is growing in light of current shifts in world politics. Accordingly, the book essay discusses how the two books Special Relationships in World Politics (Haugevik, 2018) and Enduring Alliance (Sayle, 2019) contribute to our knowledge about the international ties of the North Atlantic area. Haugevik examines bilateral American-British and British-Norwegian ‘special relationships’, while Sayles studies multilateral cooperation in NATO. They both offer interesting theoretical arguments about the interplay between diplomatic practice and national political dynamics. Moreover, they provide impressive empirical analyses to support their claims. At the same time, the two books raise new important questions, e.g. about the built-in tensions in liberal norms and values as well as about the significance of trust for enduring transatlantic ties.