Seven interwoven narratives span three tense hours on the morning of April 19. Four days after the Boston Marathon bombing, the country is still reeling. In Delaware, April Donovan's rare memory condition has her recounting all the tragedies that have cursed her birth month. In Nebraska, Lincoln Evans struggles to pay attention in Honors English, distracted by the presence of Laura Echols, capturer of his heart. His teacher tries to hold her class's interest, but can't keep her mind off what Adrian George told her earlier. In Idaho, Phoebe is having second thoughts about the Plan mere hours before the start of a cross-country ploy led by an Internet savant known as the Mastermind.