Inspector Vijay varma of the Criminal Investigation Department, Bombay is on a daring assignment to track down and bust a notorious gang of smugglers headed by the vicious Daga. Working on a tip-off from an anonymous caller, Inspector Vijay succeeds in apprehending Daga's lieutenant Balwant and thus comes to grips with childhood friend but Professional rival Ravi, a brilliant Criminal lawyer who is engaged by daga to get Balwant acquitted.
On the lookout for Inspector Vijay's secret informer, Daga learns of his crush on a beautiful girl Sheetal, who is also adored by Ravi. Seizing the opportunity Daga causes a rift between the two friends making Ravi believe that Vijay has double-crossed him.
With Ravi now Vijay's sworn enemy, Daga deviously frames Vijay for causing death of criminal, tortured by him during interrogation. Sheetal requests Ravi to defend Vijay but the latter demands a price - Sheetal herself. The stage is thus set with the odds heavily against Inspector Vijay.
Does Sheetal fulfill Ravi's conditions? What does the lawyer Ravi do? Who is the anonymous informer? What are Daga's plans? What are Vijay's chances in this dangerous game?
Dostana provides a suspenseful and breathtakingly thrilling answer.