Christopher Bryan, The Resurrection of the Messiah (OUP, 2011)
Caroline Walker Bynum, The Resurrection of the Body in Western Christianity, 200-1336 (Columbia University Press, 1995) — not an introductory book, but fascinating.
Michael Ramsey, The Resurrection of Christ (Collins, 1945)
Rowan Williams, Resurrection: Interpreting the Easter gospel (DLT, 1982)
N. T. Wright, The Resurrection of the Son of God (SPCK, 2003)
D. Stephen Long, Christian Ethics: A very short introduction (OUP, 2010)
Neil Messer, Christian Ethics: An SCM study guide (SCM, 2006)
Anna Rowlands, Catholic Social Teaching: A guide for the perplexed (Bloomsbury, 2017)
Sam Wells and Ben Quash, Introducing Christian Ethics (Wiley-Blackwell, 2010), with accompanying Christian Ethics: An introductory reader (Wiley-Blackwell, 2010)
John Taylor, The Go-Between God: The Holy Spirit and the Christian mission (SCM, 1972)
Andrew Davison, Imaginative Apologetics: Theology, philosophy and the Catholic tradition (SCM, 2011)
Pope Francis, Evangelii Gaudium: On the proclamation of the gospel in today’s world (Catholic Truth Society, 2013); and see the group study guide by Paula Gooder, The Joy of the Gospel (Church House Publishing, 2015).
David Bentley Hart, Atheist Delusions: The Christian revolution and its fashionable enemies (Yale University Press, 2010)
John Cottingham, How to Believe (Bloomsbury, 2015)
Frank L. Cross and Elizabeth A. Livingstone (eds.), Oxford Dictionary of the Christian Church (OUP, 2005)
Jean-Yves Lacoste, Encyclopedia of Christian Theology, 3 vols (Routledge, 2004) — the original French edition is much cheaper than this translation (PUF, 2007).
Ian McFarland, David Fergusson, Karen Kilby, and Iain R. Torrance (eds.), Cambridge Dictionary of Christian Theology (CUP, 2011)
Norman Tanner and Giuseppe Alberigo (eds.), Decrees of the Ecumenical Councils: From Nicaea I to Vatican II (Georgetown University Press, 1990)