Khooni Professor Part - 1

A group of Professors get together after a long time to recall their college memories. One of the College Professors, Pritam, wakes up to get some water and hears some noise upstairs. As he follows the noise, he is shocked to see Swaroop's behaviour. He tries to inform his friends Shoojit and Wasim. In the process, Pritam gets killed. Swaroop gets arrested as the prime suspect for the death. Who is behind this crime? Who killed Pritam?