The Surfside Mystery – Investigators still do not know what triggered the collapse in the middle of the night of a 12-story beachfront condominium, Champlain Towers South, in Surfside, Fla., on June 24, 2021, killing 98 people. Newly enacted laws will require mandatory inspections of older condos in Florida, and millions of owners will soon be required to set aside vast sums of money for potential repairs. Sharyn Alfonsi reports on the federal and local investigations and how the catastrophe is expected to impact the affordability of condo living for hundreds of thousands of Floridians. 

The Paper Brigade – Jon Wertheim reports from Lithuania on a group of resistance fighters who risked their lives to save a trove of Jewish artifacts during and after the Holocaust. Today, 80 years later, their heroics are still unfolding, with a search-and-rescue mission underway in Vilnius, where hidden materials continue to be uncovered. 

Sona and the Kora – Lesley Stahl profiles Sona Jobarteh, the first female virtuoso player of a centuries-old West African instrument called the kora. With 21 strings, it's described as a cross between a harp, lute, and guitar. The kora is part of a musical tradition passed down exclusively from father to son in a particular set of families in West Africa. Jobarteh, 39 years old, descends from one of those griot families – she's the daughter of a Gambian father and a British mother. Jobarteh argues that by breaking tradition, she is keeping it alive, and she's gained acceptance in the toughest place of all: The Gambia, with a hit song that's become the country's unofficial anthem. 

Grave Injustice – Scott Pelley speaks with residents and archeologists about lost graves from African American cemeteries in Clearwater, Florida. He follows their efforts as they excavate erased graveyards to help reclaim history. They describe how they plan to keep digging for truth in more of America's forgotten sites. 

Survival of the Friendliest – Anderson Cooper reports on the links between dog and human evolution and explores how dogs diverged from wolves and developed what one geneticist calls "friendliness mutations." Those mutations are found in the same genes deleted in some people with a condition called Williams Syndrome. 

Comparative Oncology – Anderson Cooper reports some of the most promising genetic research in dogs and people involves cancer. In a growing field called Comparative Oncology, scientists, physicians, and veterinarians team up to study and treat similar cancers in pet dogs and people. They use what they learn to speed potentially lifesaving treatments for both species.