Hum is a remarkable exploration of the human relationship with the unseen, unknown, and unacknowledged facets of life. In this 2020 film directed by Henry Johnston, renowned actors Oliver Pigott and Neil Burghard deliver award-worthy performances in a story that combines mystery, drama, and understated sci-fi elements. Hum is not your conventional film; it’s a journey that uncovers the layers of human emotion and existence, ultimately celebrating the human spirit.

The plot revolves primarily around its protagonist, a watchmaker named Thaniel, brilliantly played by Oliver Pigott. After his parents' tragic death, Thaniel grapples with the harsh realities of life. As he navigates through his loneliness and isolative existence, he develops an inexplicable attraction towards rhythm, patterns, and consistency, reverberating the movie's intriguing title, Hum.

During one profound late-night work session, an unexplained phenomenon occurs. His external environment starts to echo his internal solitude when all electronical devices within his vicinity abruptly cease to function. The inexplicable anomalies catalyze suspense, intrigue, and mystery, providing an excellent layer of depth to the narrative.

Against the backdrop of this peculiar event, Thaniel stumbles upon a mysterious man, magnificently portrayed by Neil Burghard. The mystery man presents himself as symptomatic, struggling with a unique neurological condition that requires constant exposure to specific frequencies to retain his vitality. Intriguingly, he seems immune to the electromagnetic disturbance that has sent Thaniel's peaceful life into chaos.

As the narrative unfolds, the audience is hooked to the intricate chemistry between Thaniel and the mystery man. Thaniel, driven by fascination and an inexplicable urge to help, starts experimenting with his precision instruments and uses his skill as a watchmaker to create a deliverable form of the frequency the stranger needs.

Hum prompts audiences to navigate through the complexity of human relationships, intimate interactions, and emotional revelations, as Thaniel tries to grapple with his increasing interest and involvement with the mystery man. The film toggles between being an emotional drama that explores inner feelings of despair and solitude and a gripping mystery that nudges viewers to question the basis of our reality.

The performances are breathtaking. As Thaniel, Oliver Pigott beautifully encapsulates the despair of a man grappling with loss and loneliness, with a simultaneous need to understand what lies beyond his realm of knowledge. His character leads the narrative with his intelligent interpretations and emotive performance, capturing every glance, silence, and action with finesse. On the other hand, Neil Burghard as the mystery man hits the right chords. He portrays layers of emotions with measured restraint, complexity, and believability.

The film wonderfully explores sound as a character in itself. There’s an enchanting blend of music, silence, and ‘hum’ that underscores the narrative throughout. The movie employs sound to evoke mystery, suspense, and revelatory emotions, taking viewers on an immersive auditory journey.

Visually, Hum has a lot to boast about. Through high definition imagery, impactful camerawork, and detailed art direction, the film presents a dystopian world where the known and unknown mingle amidst the ebb and flow of life. Each frame has been carefully crafted to reflect the many layers of the narrative.

However, Hum is not just a movie but an experience. It’s an emotional roller coaster that plunges into the mysterious realm of sound, frequency, and their impact on humans, an exploration of loss, longing, and loneliness, and finally, a celebration of human resilience. It leaves audiences with lingering questions about reality, perception, and the unknowable forces at play in our lives - a testament to its powerful storytelling and thought-provoking premise.

To sum it up, Hum is a visually tantalizing masterpiece that tolls the bell of mystery and suspense through an exploration of sound and silence. With extraordinary performances from the cast, the film shines as a riveting example of an unconventional storyline, soul-stirring acting, and a deep dive into human psyche and emotion. An amalgamation of meaningful themes, Hum will resonate with those who appreciate intricate plots and profound narratives. Undoubtedly, Hum is a fascinating cinematic journey worth embarking on!