John Jay College of Criminal Justice was shaken to its soul by the events of Sept. 11. Its very mission is bound up with the work of police officers and firefighters, and more than 100 of its alumni and students were lost in the collapse of the World Trade Center.

Now, more than a month after the attack, John Jay is trying to regain a semblance of normality. But to spend a day at the college, one of 17 undergraduate campuses of the City University of New York, is to understand that echoes of the attack are never far away