Samantar begins with atheist Kumar Mahajan (Swapnil Joshi) getting into a grave accident. His friend Sharad takes him to meet a Swami, despite Kumar's disbelief in God. The Swami shocks Kumar by recounting details of his past that only he knew, piquing Kumar's interest.

Sharad is irked that Kumar didn't share his past, as Kumar explains his misfortunes. The Swami then proves he had met a man named Sudarshan, whose palm lines and fate match Kumar's. The Swami refuses to reveal Kumar's future, angering him. Just then, Kumar gets a call about his son's accident and financial troubles.

Kumar goes to Ghatkopar to learn more about Sudarshan, who left Mumbai 40 years ago after a fraud. Just then, Sharad tells Kumar he's been transferred to Kolhapur. Nima is upset but agrees to visit a fortune-teller with Kumar, though the teller has passed away.

Invited to a dinner party by his boss in Kolhapur, Kumar expresses his desire to stay in the mysterious Blue Moon Cottage he spotted from his window. Despite warnings from his house help Hanmya, Kumar's boss agrees. At the cottage, Kumar senses a presence and nearly falls off a cliff, as Hanmya reveals a similar incident happened there years ago.

A man who claims to know about Sudarshan shows up at Blue Moon Cottage, revealing Sudarshan worked at Imperial Woods and he saved his life. The next day, Kumar finds a painting of a woman in the cottage, which Hanmya says belonged to Sudarshan, who had stayed there decades ago.

Traveling to Karjat, Kumar learns Sudarshan had an accident while working at Malabar Woods. He tracks down Ramchandra, who reveals Sudarshan owns a large bungalow in Chiplun. But before Ramchandra can share more, he is killed in an accident. Undeterred, Kumar decides to go to Chiplun, despite his wife Nima's attempts to stop him.