"Everyone thinks he knows Ronald Reagan, but those who truly knew him best still grapple with the enduring mystery of his inner character."

Even after his death in 2004, Ronald Reagan remains one of America's most popular and beloved presidents, but he is also a man whom history and his own privacy have conspired to turn into a remote icon.

Ron Reagan celebrates the centenary of his father's birth by visiting the towns that shaped him to share both his own memories and a uniquely privileged portrait of a young "Dutch" Reagan. My Father at 100 illuminates a father, a...