A thief is given a powerful time-altering tool to steal valuable works of art for a mysterious collector. Based on a clever short story by Arthur C. Clarke, this is one of the better 'Tales of Tomorrow' episodes (despite a couple of minor plot flaws, one caused by an unnecessary change in the timing of the last few 'milliseconds' between the show and the original story). Like a lot of Clarke's stories (and anthology episodes in general), most of the story is essentially a set-up for the 'surprise ending' but the teleplay is quite well done and entertaining (even if you know the 'twist'). As a long-time devotee of time-travel tales, I always liked Clarke's timely 'be careful what you wish for' cautionary tale.