From the Back Cover:
"In a bold and daring attack, a S.T.A.R Lab's entire supply of a new secret gas is stolen. The villains responsible now have the means to destroy all the world's heroes.
THE BROTHERHOOD OF EVIL HAS STRUCK!
Meanwhile, the Titans are called upon to save a controversial world leader from assassination — his death could unleash violence across the globe.
With no way to split up, and time running out, the New Teen Titans must choose. They must recover the powerful gas or...
STOP THE ASSASSIN
There's more here than meets the eye and the Titans are trapped in the midst of a Blood Feud!"