On a late June Friday evening, Marc Heinberg, a 61-year old man, was walking home from synagogue along Gravesend Neck Road; Neck Road to the locals. Neck Road is classic Brooklyn; a scattering of modest brick houses along a tree-lined street, but a short walk down “The Neck” takes you to Nostrand Avenue and from there to the Sheepshead-Nostrand housing projects where crime is common and life is cheap. Sheepshead-Nostrand, where drug deals go down, shots are fired and gruesome murders are a local tradition, and the tree-lined portion of “The Neck” where Marc Heinberg was walking home, are two...