midnight
Well , keep a lookout for him , and do n't let him in , '' and with that Tom entered the house to think over matters . They were beginning to assume an aspect he did not altogether like . Not that Tom was afraid of danger , but he preferred to meet it in the open , and the warning , or threat , of the mysterious man disquieted him . When Mr. Swift came home , a little later , his son told him of the midnight interview with Mr. Jenks , for , up to this time , the aged inventor was unaware of it , and Tom also gave an account of the diamonds , speaking of their value . `` And do you propose to go to Phantom Mountain , in search of the makers of these gems , Tom ? '' asked Mr. Swift . `` I had about decided to do so , dad . ''