Five hundred crore rupees of mafia cash, a casino, a hidden pen drive and a man drowning in debt. On paper, ‘Sigma’ has everything a heist thriller needs. On screen, it forgets to add the thrill.

Jason Sanjay, son of actor Vijay, steps into the director's chair for the first time with ‘Sigma’, produced by Subaskaran under Lyca Productions.

The story follows Guru (Sundeep Kishan), a young man buried under debt. His one dream is to save a library that holds his late mother's memories. Desperate for money, he walks into a casino and lands in trouble he never planned for. A pen drive that everyone seems to want and a mysterious key then drag him into a chase around a huge stash of black money hidden abroad.

It's a promising premise. The problem is what the film does with it.

The first half spends a lot of time on Guru's (Sundeep Kishan) money worries and his fight for the library. That gives us a reason to care about him, but the heist the film builds itself around is frustratingly slow to take shape.

The speed and excitement the trailers promised don't arrive until the interval fight. You'd expect the second half to make up for it, but things come and go without leaving a mark.

The film also keeps adding twists and new faces, but few of them land with real surprise. By the end, you're watching events happen rather than being pulled into them.

The supporting cast is big. Faria Abdullah, Sampath Raj, Raju Sundaram, Shiv Panditt, Anbu Thasan, Yog Japee and others all appear, along with characters like Sarangi, Ezhil and Vincent. Yet very few get a proper backstory or personality. Some characters who seem important just pass by.

Sundeep Kishan gets a lead role with room to perform, but the way Guru is written doesn't ask much of him. He does his job, yet the performance doesn't stay with you.

What works

The technical side is solid. The film looks fairly grand, and the sound work is clean and effective. S Thaman's music gives the film energy, and the background score is one of its stronger points.

There is some humour along the way, which keeps things light in places. The look of the film (cinematography by Krishnan Vasanth, action by Venkat and Silva) shows the team put effort in. Jason Sanjay also doesn't look like a nervous first-timer.

It's a decent first step for Jason Sanjay. The film is made with confidence. What's missing is the sharp, surprising writing that a heist story lives on, and no amount of polish can cover that gap.

‘Sigma’ works best when you don't ask too much of it. It's an easy watch if you're in the mood for uncomplicated action and don't mind a lack of originality. But as a heist thriller, it doesn't offer enough surprises to really stand out.

Rating: 2 out of 5

(Disclaimer: This review reflects the writer’s personal opinion of the film and is based on the viewing experience)