相隔幾個世代的陳丹青與木心於異地相識相知，建立起亦師亦友的關係。本書是陳丹青在師尊木心身故後寫成的十萬字文稿。作者以其極盡寫實與簡約的文筆，鄭重坦率而堅拒濫情，寫下了對木心最後的守護與送別過程，淒楚動人。書中文字真摯的記錄了對木心的觀察、剖析，讀著彷彿經歷了木心一生的鬱鬱不得志；與學生俏皮的對話；對書寫繪畫的執著及洞見。難能可貴的私房話，非常木心，非常陳丹青，現與讀者分享。

「我不想限制篇幅，不願遺漏種種細節。這是木心以自己的性命的完結，給我上最後一課。」

Having established a cross-generational friendship, Chen Danqing details how he came to know Mu Xin and their last shared moments before the death of Mu. Their friendship also embodies a precious teacher-student relationship, allowing Chen to observe different faces of Mu from his conversations with students and creation journey. With sincerity and gratitude, the book pays final tribute to his forever mentor and friend.