在距離城市遙遠之外的台灣森林裏，一對母女過著與世隔絕的日子。女兒（桂綸鎂 飾）的精神狀態看來脆弱且無助，彷彿對周遭一切了無生趣。原來在來到這裏之前，女兒是個知名的鋼琴家，但她的丈夫和兒子被殺了，原因似乎和一椿巨大的關說案有關。對山林環境相當熟悉的母親（陸弈靜 飾），毅然決然帶著女兒、拋下一切，躲到了最接近原始的深山森林裏，她堅信這是能夠保護她、拯救她，並讓她好好活下去的唯一可能。

《德布西森林》是新導演郭承衢的長片，故事描述在城市裡發生了一些事後，母親陸弈靜毅然決然帶著女兒桂綸鎂，拋下一切，躲到無人能找到的深山中！媽媽堅信，這是讓母女能活下去的惟一生路，但入山之後，她們面對的，只剩彼此，還有那放眼望去的一整座森林。

Deep in the barren mountains, a mother and a daughter live an isolated quiet life. The Daughter looks lean and fragile. She seems unreactive toward her surroundings, confining herself in her own wretched world. The Mother is like a guardian angel who always protects her and takes care of everything. Before living in seclusion, The Daughter was a pianist who lost her husband and son. The Mother decided to take her away and hid her in the mountains where no one could ever find them, believing it is the only possible way for her daughter to survive, Nevertheless, they have to face nothing but themselves ever since, as well as to confront the endless forest…