Three patients are described who were admitted to hospital with septicaemic shock due to gallstones, but in none of whom had the presence of gallstones, been diagnosed previously. All 3 had positive blood cultures, Clostridium welchii being isolated in one patient (in another patient this organism was isolated from the bile). Two patients had renal failure requiring dialysis. All 3 patients survived. The management of this serious presentation of gallstones, hitherto poorly described in British literature, is discussed.