Who winds up on Rikers Island and why? What will it take to close the troubled jail complex? Those are some critical questions raised in Vital City’s special issue on New York City’s jails. In their contribution to the issue, our policy experts Daniel Ades and Virginia Barber Rioja make the case for investing in supportive housing, not jail, for people with serious mental illness—a desperately needed alternative that is cheaper, more humane, and safer for us all.