nine o’clock in the evening
`` The fellow 's clean off his chump ! '' muttered Lupin . `` By Jove ! ... To disturb the police at nine o'clock in the evening : there 's a notion for you ! '' He set to work again . It took longer than he expected , for they discovered in the cupboards all sorts of valuable knick-knacks which it would have been very wrong to disdain and , on the other hand , Vaucheray and Gilbert were going about their investigations with signs of laboured concentration that nonplussed him . At long last , he lost his patience : `` That will do ! ''