Back in 2013, The American Lawyer marked the 30th anniversary of the 1983 Beirut barracks attack by pointing out that the victims’ families were still waiting for justice. In 2001, some 812 family members sued the government of Iran for directing the powerful car bombing by Hezbollah extremists that killed 241 U.S. Marines.

The families are still waiting. But after 33 years, they are now closing in on an unprecedented multibillion-dollar recovery in the case, Peterson v. Islamic Republic of Iran.