This is a pre-copyedited, author-produced version of an article accepted for publication in Parliamentary Affairs following peer review. The version of record John Nagle; Between Conflict and Peace: An Analysis of the Complex Consequences of the Good Friday Agreement, Parliamentary Affairs, Volume 71, Issue 2, 1 April 2018, Pages 395–416, is available online at: https://doi.org/10.1093/pa/gsx030.