Who is the killer?

Who is the killer? Back in Delhi, the entire Delhi High campus is mourning the death of the second year student Suzana Joseph Mukherjee. No one knows much about her, but Araina realises that Suzana could have been the girl blackmailing her? All the students are called for an investigation and the police find the murder weapon which has Shaurya's fingerprints. Shaurya is arrested. Nitasha is heartbroken. She is certain Shaurya is not the murderer. Is she right?