Eel has troubles of his own: As an orphan and a "mudlark," he spends his days in the filthy River Thames, searching for bits of things to sell. He's being hunted by Fisheye Bill Tyler, and a nastier man never walked the streets of London. And he's got a secret that costs him four precious shillings a week to keep safe.and But even for Eel, things aren't so bad until that fateful August day in 1854and—the day the Great Trouble begins. Mr. Griggs, the tailor, is the first to get sick. Soon it's clear that the deadly choleraand—the "blue death"and—has come to Broad Street.and Everyone believes that cholera is spread through poisonous air. But one man, Dr. John Snow, has a different theory. As the epidemic surges, it's up to Eel and his best friend Florrie to gather evidence to prove Dr. Snow's theoryand—that cholera is spread throughand waterand—before the entire neighborhood is wiped out.