'Oppam' is all set to become our biggest hit, said a visibly excited Priyadarshan as the film opened across the state on Thursday.Oppam is a Malayalam crime thriller scripted and directed by Priyadarshan, based on a story by Govind Vijayan.In a chat with IANS, the 59-year-old master storyteller said he is on his way to Kozhikode to be with Mohanlal, who plays the central character in the film."It seems this is going to be the biggest hit of ours. Lal is excited, so am I. He asked me to join him to celebrate the excellent reviews that have come on day one of the release. We have decided to do some promotion, as that's the order of the day, soon after the film is released. So, I am rushing to Kozhikode to be with him," said Priyadarshan.The director, who has till date directed 91 films, said it is the first time in his career that he has made a crime thriller.The duo has in the past produced superhit movies like 'Vellanakalude Nadu', 'Kilukkam', 'Thenmavin Kombathu' etc. but this magic failed to succeed in the recent past. "The wait was worth it and we are elated," added Priyadarshan.