Books, ranked

Excellent

  • The Bible
  • The Design of Everyday Things - Donald A. Norman
  • Christian Theology: An Introduction - Alister E. McGrath
  • Learned Optimism - Martin Seligman
  • Studies in the Sermon on the Mount - D. Martyn Lloyd-Jones

Great

  • The Resurrection of Jesus: A New Historiographical Approach - Michael R. Licona
  • The Case for Christ - Lee Strobel
  • The Cross - Martyn Lloyd-Jones
  • Kant: A Very Short Introduction - Roger Scruton
  • How to Hear God - Pete Greig

Good

  • Plato: A Very Short Introduction - Julia Annas
  • Confucianism: A Very Short Introduction - Daniel K. Gardner
  • Judaism: A Very Short Introduction - Norman Solomon
  • Islam: A Very Short Introduction - Malise Ruthven
  • Scripture and the Authority of God - Tom Wright
  • Mere Christianity - C.S. Lewis
  • Evidence That Demands A Verdict - Josh McDowell & Sean McDowell
  • Why Has Nobody Told Me This Before? - Julie Smith
  • Florence Nightingale: Letters and Reflections - Rosemary Hartill
  • Letters of Note - Shaun Usher
  • Quirkology - Richard Wiseman
  • Sex, Drugs & Rock n Roll: The Science of Hedonism and the Hedonism of Science - Zoe Cormier
  • How the Mind Works - Stephen Pinker
  • Shantaram - Gregory David Roberts
  • Problem Frames - Michael Jackson
  • Reimagining Britain - Justin Welby

Mediocre

  • Mathematics: A Very Short Introduction - Timothy Gowers
  • Computer Science: A Very Short Introduction - Subrata Dasgupta
  • Thought: A Very Short Introduction - Tim Bayne

Bad

  • Logic: A Very Short Introduction - Graham Priest
  • The Qur'an