You're asking about '1984' by George Orwell, not a book called 'Julia 1984'. Julia's a major character, but the novel's title is just '1984'. The main plot follows Winston Smith, a low-ranking member of the ruling Party in a super-state called Oceania, where the government, led by the enigmatic Big Brother, exercises total control over reality, thought, and history. Winston's job at the Ministry of Truth is to alter historical records to match the Party's ever-changing narratives, but he secretly hates the Party and starts a forbidden diary—a 'thoughtcrime.'
The plot truly kicks into gear when he begins a clandestine affair with Julia, a coworker who outwardly seems a fanatical Party loyalist but is actually rebellious in her own, more physical and pragmatic way. Their relationship in a rented room above a proletariat shop is an act of pure political defiance. Winston becomes obsessed with the idea of joining the Brotherhood, a rumored resistance movement, and believes a high-ranking Inner Party member named O'Brien is a secret member. The novel's terrifying climax involves their capture, Winston's torture and re-education in the Ministry of Love, and the systematic destruction of his spirit and love for Julia, culminating in his complete, horrified acceptance of Party doctrine.
What makes the plot so enduring isn't just the dystopian setting, but how it maps the disintegration of a single mind under absolute power. The ending isn't a rebellion; it's a profound, soul-crushing defeat, which is why it sticks with you long after you finish.