John Grisham is famous for his legal thrillers, but his latest book, “The Tumor,” explores the promise of modern healthcare and the tool that could change how we battle dozens of disease. Grisham tells Chip Reid why he thinks the 47-page book is so important that he’s giving it away for free. Source

Speaker of the House Paul Ryan has said multiple times he wouldn’t accept the Republican nomination for president if it were offered to him, but Stephen Colbert isn’t exactly convinced. Source

Prince William and Prince Harry got the royal treatment when they went to visit the set and cast of the next “Star Wars” movie in London. CBSN’s Vladimir Duthiers has details. Source

Destiny Watford grew up in Curtis Bay, a part of Baltimore with some of the worst air pollution in the country. She made it her mission to stop construction of a huge new industrial incinerator less than a mile from her high school, and the project has now lost its permit. Source

It’s been one year since the death of Freddie Gray, a black man who died while in police custody. Gray’s death led to violent clashes and a national debate over the relationship between police and the black community. Deray McKesson is an activist and Baltimore mayoral candidate, and joins CBSN to discuss what has changed in the city since last year. Source

New York primary voting is underway, and expectations are high for Donald Trump and Hillary Clinton. Both frontrunners have already cast their ballots. CBSN political contributor Leslie Sanchez and Democratic strategist Emily Tisch Sussman join CBSN with more on what to expect from today’s polls. Source

A new report is highlighting the alleged failures of Secret Service security during a fence jumping incident at the White House in 2014. CBS News justice and homeland security correspondent Jeff Pegues joins CBSN to discuss the security concerns. Source

Wood, a correspondent for “The Daily Show,” also talked about what politics has in common with sports. Source

Federal officials have reportedly launched a criminal investigation into blood testing company Theranos. The Wall Street Journal reports the Justice Department and the Securities and Exchange Commission are looking into whether the biotech startup misled investors, partners or government officials about its testing technology that uses drops of blood instead of vials. Last month, “CBS This Morning” co-host Norah O’Donnell spoke with Wall Street Journal investigative reporter John Carreyrou, who broke the news of the company’s problems. Source

Actress Doris Roberts is being remembered for her iconic portrayal of a loving, if overbearing, TV mom. She’s best known for playing Marie Barone on the long-running CBS hit show, “Everybody Loves Raymond.” The role defined a career that lasted more than half a century. Gayle King reports. Source