One Man's Island focuses on the journey of a man named Mark Gardiner, a former sergeant in the Canadian Armed Forces who takes on a great adventure of his life, capturing the true essence of daring, passion, defying odds and living one's dream regardless of the personal cost and hardships along the way.

Mark Gardiner, in his mid-forties, walks away from an impressive career and a comfortable life in his homeland to chase his ultimate lifelong dream - to race motorcycles in the world's most dangerous and prestigious road race - the International Isle of Man Tourist Trophy in the United Kingdom. This 37.75 mile race course is known for its challenges of narrow, bumpy, twisting roads which have taken the lives of over 220 racers since its inception in 1907.

The documentary gives a detailed look at Mark's preparation and determination as he journeyed from Canada to participate, train and compete in the harsh and high-stakes world of the Isle of Man TT. Meanwhile, his wife stands by, ever supporting and sharing his dream while concurrently dealing with the swirling fear concerning the perils of his decision.

As a part of his preparation, Mark commences rigorous physical training and fitness regimen, learning from professional guides and mentors, riding on difficult tracks, while also handling the technical aspects of his motorcycle. The documentary meticulously captures these moments, crafting a portrait of a man determined to follow his passion at any cost.

Directed by Peter Riddihough, the film takes an emotive, in-depth look into Mark’s life, his struggles, his aspirations, and the people around him who are both inspired and worried by his audacious dreams. It beautifully portrays the fragility of the human spirit, the fearlessness required to tread this dangerous path and the deep emotional toll on everyone involved.

The film is rich with incredible racing footage, giving audiences a firsthand view of the adrenaline-fueled experience of the race course, not only from the perspective of extreme athletes but also from the viewpoint of regular people who dare to dream big. The realistic portrayal of the sport is commendable and will leave motorcycle racing fans and enthusiasts engrossed.

Riddihough contrasts the high-speed action on the race track with more contemplative moments as Mark faces challengers, both professionally and personally. Mark's personal reflection about what drives him to take such risks, his determination to prove that it’s never too late to pursue one's dream, and the support of his wife, despite the looming dangers, forms the crux of the narrative.

However, One Man's Island is more than just a motorcycle racing film. It's about hope, passion, struggle, and the sheer will of a man to overcome the odds. The viewer gets a glimpse into Mark's inner thoughts, fears, and dreams and his confusing blend of dread and excitement, thereby embodying the universal human condition of navigating our ambitions and their corresponding anxieties.

A profound element of One Man's Island is its juxtaposition of the love for life and the risk of death inherent in the sport, handled brilliantly to shed light on the harsh realities faced by these adrenaline-seeking athletes. It spins an intriguing web around the psyche of a man who dares to attempt the impossible and how he deals with immense pressure to prove himself.

One Man's Island truly encapsulates the spirit and audaciousness of Mark Gardiner, creating an impactful and riveting experience for the viewers. It is an inspirational tale of a man's dream, his struggles and resilience, and his thrilling and risky voyage. The documentary does more than just capture the thrill and speed of motorcycle racing; it delves into the human spirit, the fearlessness to face up to life-threatening challenges, and the affirmation that it’s never too late to follow your heart, no matter the cost.

In essence, One Man's Island is both a motor-racing film and an intense life-drama that will appeal to a wide range of audiences. It's an honest narration of an incredible man's dream, coupled with stunning visuals of one of the world most dangerous motorcycle race, making it a must-watch for anyone who cherishes and celebrates the human spirit's resilience and quest for achievement.