Horace Danby was a meticulous planner but still he faltered. Where did he go wrong and why?

Horace Danby failed to get enough information about real occupants of the house. He was so occupied with collecting information about house map, wiring and location of valuable things that he forgot one main aspect. Though he was smart enough to know the dog’s actual name but overlooked getting identity of each and every occupants of the house. Once he was in problem then probably his clever mind gave way to carelessness leading him to open the safe without wearing gloves.

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