美國神話學大師Joseph Campbell於1948年作品The Hero With Thousands of Faces《千面英雄》，英雄與每個人都一樣，處在一個普通世界和冒險國度，當面臨命運的羈絆或挑戰，英雄勇於脫離原有的普通世界、進入不可測的冒險國度，依據這個理論，本身是藝術家也是作家的Elle Luna，相信人人都是英雄，在這樣理論下，發展出更合於這個世代的背景，將全書分成＜站在十字路口＞、＜天賦之地＞、＜必須之路＞與＜回歸旅程＞等四大篇章，描述了現代人應該如何踏入看似充滿挑戰與危機的洞穴，儘管無法預知未來，也不能像編劇家一樣自由揮灑，但了解自己想要的與應該作的，還有此生必須完成的任務，才能創造命運，扭轉命定。
Who hasn't asked the question "How can I find and follow my true calling?" Elle Luna frames this moment as "standing at the crossroads of Should and Must." "Should" is what we feel we ought to be doing, or what is expected of us. "Must" is the thing we dream of doing, our heart's desire. And it was her own personal journey that inspired Elle Luna to write a brief online manifesto that, in a few short months, has touched hundreds of thousands of people who've read it or heard Elle speak on the topic. Now Ms. Luna expands her ideas into an inspirational, highly visual gift book for every recent graduate, every artist, every seeker, every career changer. The Crossroads of Should and Must has a universal message--we get to choose the path between Should and Must. And it gives every reader permission to embrace this message. It's about the difference between jobs, careers, and callings. The difference between going to work and becoming one with your work. Why knowing what you want is often the hardest part. It gives eye-opening techniques for reconnecting with one's inner voice, like writing your own obituary (talk about putting life in perspective). It talks about the most common fears of choosing Must over Should--money, time, space, and the ultimate fear: total vulnerability--and shores up our hesitation with inspiring stories of and quotes from the artists and writers and thinkers who've faced their own crossroads of Should and Must and taken the leap. It explains the importance of mistakes, of "unlearning," of solitude, of keeping moving, of following a soul path. Presented in four chapters--The Crossroads, The Origin of Should, Must, and The Return--inspired by the hero's journey outlined by Joseph Campbell, The Crossroads of Should and Must guides us from the small moment, discovering our Must, to the big moment--actually doing something about it, and returning to share our new gifts with the world.