Thoongaa Vanam is an Indian Tamil-language crime thriller film directed by Rajesh M. Selva . The star cast has Kamal Hassan, Prakash Raj, Trisha Krishnan, Kishore, Sampath Raj, Yugi Sethu, Asha Sarath and Madhu Shalini.

Plot: The film begins with Diwakar (Kamal Haasan), an Indian Revenue Service officer in the Narcotics Control Bureau, and his deputy Mani (Yugi Sethu), busting a narcotics scam. In retribution, Vittal Rao (Prakash Raj), a drug smuggler who had masterminded the scam, kidnaps Diwakar's son Vasu (Aman Abdullah). He is willing to release Vasu if Diwakar can return to him a bag of cocaine he seized while thwarting the scam. Without any options, Diwakar agrees and proceeds to Vittal's nightclub where Vasu is held hostage with the bag of cocaine, hiding it in the men's toilet. However, this is noticed by his colleague Mallika (Trisha), who becomes suspicious and thinking that Diwakar is involved in drug smuggling, informs her superior Draviyam (Kishore). Both begin to pursue Diwakar, taking away the bag of cocaine from the toilet in the process. When Diwakar realises that the bag of cocaine has gone missing, he decides to return to Vittal a bag containing packets of maida instead, thinking that he and his cronies including a gangster Pedha Babu (Sampath Raj) won't realise the difference. Unfortuanately, Vittal and Pedha soon find out that Diwakar had cheated them and decide to kill him. Caught between Vittal's gang on one side and Mallika and Dhraviyam on the other side, Diwakar confronts Mallika and tells her that contrary to her suspicions, he is working undercover and had planned the entire operation to expose police officers such as Draviyam and even Mani, who are involved in drug smuggling. Then he rescues Vasu without Vittal's knowledge and Vittal is also arrested by Mallika and Draviyam. While taking Vittal to prison, Mallika finds out that she has Mani's mobile phone and on reading the messages in it, finds out that Diwakar had been speaking the truth all along, realising that Draviyam and Mani are involved in drug smuggling and had tried to frame Diwakar. Though Draviyam tries to resist arrest, killing Vittal in the process, he is eventually brought to justice. Three months later, Mallika is now Diwakar's deputy. The movie ends with both of them thwarting the attempted murder of a police officer.