LONG BEFORE the sun rose the waters came rushing. Heavy rain swelled the rivers of Texas’s hill country until they burst, drowning people, cars and trailers before dawn on July 4th. Greg Abbott, Texas’s governor, announced five days later that the storm had killed 109 people and that 173 are still missing. More than two dozen of the dead are children and counsellors from Camp Mystic, a Christian summer camp for girls whose cabins dotted the bank of the Guadalupe River. As ground crews comb the mud for bodies, many people are asking the same question. What went so terribly wrong?