Anthony Storr has written lots of excellent psychotherapy books such as Art of Psychotherapy, Churchill's Black Dog, Other Phenomena of the Human Mind, and Feet of Clay: Study of Gurus, and one of the greatest introductions to Jung there is Jung (Modern Masters) .
Storr writes as an integrative thinker, cutting across boundaries to identify and share essential truths, his introduction to Freud is therefore an equally great read for the unacquainted reader and familiar alike.
Anthony Stevens has written excellent books on topics associated with Jungian perspectives, including Archetype, Revisited: An Updated Natural History of the Self or Private Myths: Dreams and Dreaming (Penguin psychology) and writes an introduction to Jung which is second only to that of Storr.
Each introduction has great content and index included in this single volume and each introduction is a perfect companion to one another. The writing style of each author is highly complementary, providing for a good continuity in pace, style, and content.