The film follows Diana, a successful businesswoman in her 40s, who decides to undergo a facelift to regain her youthful appearance. After the surgery, she begins to experience strange and unexplainable events, which she initially attributes to the recovery process. However, as the events escalate, Diana becomes convinced that her new face is not her own and that someone is impersonating her.

The cinematography in "The Hidden Face" is noteworthy for its use of close-ups and point-of-view shots, which create a sense of intimacy and immediacy with the protagonist. The camera work is often disorienting and unsettling, mirroring Diana's growing sense of unease and disorientation.

One of the primary themes of "The Hidden Face" is the exploration of identity and self-perception. The film raises questions about the nature of identity and how it is constructed, particularly in relation to physical appearance. Diana's facelift serves as a catalyst for her identity crisis, as she struggles to come to terms with her new appearance and the sense of self that comes with it.