The plot follows the story of two girls - Dhanushree a.k.a. Dhannu and Tanushree a.k.a. Tannu who are caring housewives and also, work as secret agents for their father-in-law, Dinanath Chauhan alias Agent Himalaya. Dhannu alias Agent Laal Kila is married to Dinanath's elder son Shaurya Chauhan who is an honest and brave police inspector and Tannu alias Agent Hawa Mahal marries Dinanath's younger son, Garv Chauhan who is a crime news reporter. On their wedding day, when time comes to leave the maternal home, Tannu locks the door of her room and refuses to leave. When asked, she confesses to Dinanath that she likes Garv but doesn't wish to go to her marital home and sacrifice her profession, which is a secret. But Dinanath reveals that he is aware of her secret, that she is UCA 's secret agent and then he mentions that he is also an UCA agent, Agent Himalaya and henceforth she would continue in her profession by joining his secret army with another agent. Tannu then gladly accepts to leave for her new home and also thinks that the agent who would be joining her is her brother-in-law, Shaurya. On their way they stop at a temple to complete Dhannu's mannat regarding this marriage. But, as they were about to leave the temple after completing the mannat, a group of thieves threaten the entire Chauhan family and they are taken to a distant place. There it is revealed to us that the second agent is Dhannu! The duo then beat up the goons and all the family members manage to escape. But Garv and Tannu are unable to spend time together on their wedding night as Tannu is called to Dinanath's secret lab where she is introduced to many new gadgets. But one day, Dinanath's younger daughter Manya Chauhan a.k.a. Mannu comes to know about the secret of Tannu, Dhannu and Dinanath that they are secret agents and wants to join their team as "Agent Qutub Minar" or else she will tell everyone, especially her mom, the secret. On a fake mission, which coincidentally turns real, Mannu saves her co -agents and gets permission to receive training and become an agent and then the agents get known as "Trideviyaan". They always manage to hide their secret identity from Dinanath's wife Suhasini Chauhan, his mother Damyanti Chauhan who is a kleptomaniac, Fatteh Mama - the servant, the paying guests and even from Shaurya and Garv. With Dhannu's muscular power, Tannu's speed and Mannu's power of voice, they pose as the most formidable team.
Cast
Main cast
Aishwarya Sakhuja as Dhanshree Chauhan aka Dhannu / Agent Laal Kila. Shaurya's wife,Dinanath's elder daughter in law,Mannu's sister in law.
Samaira Rao as Tanuja Chauhan aka Tannu / Agent Hawa Mahal. Garv's wife,Dinanath's younger daughter in law,Mannu's sister in law.
Shalini Sahuta as Manya Chauhan aka Mannu / Agent Qutub Minar.Dinanath's daughter,Shaurya and Garv's younger sister,Prem's love interest
Rituraj Singh as Dinanath Chauhan 'Dad Ji', DN / Agent Himalaya,Dhannu and Tannu's father in law,Suhasini's husband,Shaurya,Garv and Mannu's father
Anshul Trivedi as Shaurya Chauhan,a brave inspector, Dhannu's husband,Garv and Mannu's elder brother
Winy Tripathi as Garv Chauhan,A crime reporter,Tannu's husband,Shaurya and Mannu's brother
Dhruvee Haldanker as Suhasini Chauhan aka Su /Saasu mom,Dinanath's wife,Dhannu and Tannu's mother in law,Shaurya,Garv and Mannu's mother
Sameer S Sharma as Fatteh Singh / Fatteh Mama. An innocent worker at DN's house
Recurring cast
Charu Rohatgi as Damyanti Chauhan/Dadi,Dhannu and Tannu's grandmother in law,Dinanath's mother,Shaurya, Garv and Mannu's grandmother
Shraman Jain as Amar Bhatia/Dr. Amar Bhatia, Prem's best friend
Aditya Kapadia as Prem Kumar/Promila Bhottacharya Bhatia,Mannu's love interest
