A book 50 years in coming, “The Kennedy Detail” is a portrait of incredible camaraderie and incredible heartbreak, too. The book, new at the Abington Community Library, was written by Gerald Blaine, who served under three U. S. presidents as a Special Agent of the Secret Service on the White House detail, and Lisa McCubbin, an award-winning journalist. Blaine, who was a member of President Kennedy’s Secret Service team on November 22, 1963, reveals the inside story of the assassination, the weeks and days that led to it, and its heartrending aftermath. He draws on the memories of his fellow agents to capture the energetic, crowd-loving young president; the careful planning that went into his Texas trip; and the worries and concerns the agents had. Most of all, this is a look into the lives of men who devoted their entire beings to protecting the presidential family, the emotional bonds that developed, and the terrible impact on the agents and their families.