The Great Trouble. A Mystery of London, the Blue Death, and a Boy Called Eel

The suspenseful tale of two courageous kids and one inquisitive scientist who teamed up to stop an epidemic."A delightful combination of race-against-the-clock medical mystery and outwit-the-bad-guys adventure." -Publishers Weekly, Starred   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. But even for Eel, things aren't so bad until that fateful August day in 1854-the day the deadly cholera epidemic ("blue death") comes to Broad Street.   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 theory-before the entire neighborhood is wiped out.   "Hopkinson illuminates a pivotal chapter in the history of public health.