From the back cover:
The Mathematics of Murder
A killing spree is horrifying enough. When all eight members of the Ridgeway family are gunned down by a math student who then kills himself, Delta Green sees hints that make it more terrible still. Your Agents have to stop the madness before it spreads.
The Last Equation is a full-color scenario of personal apocalypse and lethal mystery. It is playable with Delta Green: Need to Know or Delta Green: Agent’s Handbook, available from Arc Dream Publishing.
The Last Equation is a poisonous little pill of a scenario. Prepare to have some especially bleak fun with your players.