midnight
`` You must wait until -- '' He broke off abruptly and stepped behind his counter , for a man in the uniform of a Spanish lieutenant had entered the store . The new-comer walked directly to O'Reilly ; he was a clean-cut , alert young fellow . After a searching glance around the place he spoke in a voice audible to both men : `` Senor , you are in danger . To-night , at midnight , you will be arrested . I beg of you to see that there is nothing incriminating in your possession . '' O'Reilly 's face betrayed his amazement . `` Arrested ?