一个放高利贷的病人,有一天早晨在医院的病床上被人用水果刀刺死。凶器是在医院的花园里找到的。由于凶手在行凶时用布裹着刀,刀柄上没有凶手的指纹,但在水果刀被发现时,细心的侦探发现刀柄上爬着许多蚂蚁。行凶时医院尚未开门,所以警方认为凶手很可能也是医院病人。 One loan-sharking patient was stabbed by a fruit knife one morning in a hospital bed. The weapon was found in the hospital garden. As the murderer wrapped his knife in cloth at the time of the attack, there was no fingerprint of the murderer on the handle, but when the fruit knife was found, careful detectives found many ants crawling along the handle. The hospital has not opened the door at the time of the attack, so the police think the murderer is also likely to be a hospital patient.