Introduction:
Horace Danby, the main character in the short story "The Destructors" by Graham Greene, is portrayed as a highly skilled and dexterous robber. His exceptional ability to plan and execute a successful robbery demonstrates his dexterity in the criminal activity.

Planning:
Danby's dexterity is evident from the meticulous planning he undertakes before carrying out the robbery. He carefully studies his target, a wealthy and unsuspecting collector of valuable jewels, Mr. Isaacstein. Danby observes Isaacstein's routine and habits, noting the opportune moment to strike. This level of attention to detail showcases his expertise in planning.

Breaking and Entering:
Danby's ability to break into Isaacstein's heavily secured mansion without arousing suspicion further highlights his dexterity as a robber. He skillfully overcomes various security measures, such as alarms, locks, and surveillance systems. His knowledge of advanced techniques and tools allows him to bypass these obstacles with ease.

Safe-Cracking:
One of the most impressive displays of Danby's dexterity is his proficiency in safe-cracking. He effortlessly cracks open Isaacstein's state-of-the-art safe using his specialized knowledge and tools. His skill in manipulating the intricate mechanisms of the safe demonstrates his exceptional manual dexterity and precision.

Escaping:
After successfully stealing the valuable jewels, Danby's ability to escape undetected showcases his quick thinking and adaptability. He carefully plans his exit strategy, considering factors such as possible witnesses and potential obstacles. Danby's agility and nimbleness allow him to evade capture, leaving no trace behind.

Attention to Detail:
Throughout the entire process, Danby's attention to detail is evident. He meticulously plans every step, taking into account even the smallest of factors that could jeopardize his success. This level of detail-oriented thinking not only reflects his dexterity but also his ability to anticipate and mitigate potential risks.

Conclusion:
Horace Danby's dexterity in robbing is demonstrated through his meticulous planning, skill in breaking and entering, proficiency in safe-cracking, ability to escape undetected, and attention to detail. His expertise in these areas showcases his exceptional skills as a thief and highlights his ability to carry out successful robberies.