What method do McBride and Bayliss employ to find the person sabotaging their plans?

The method McBride and Bayliss employ to find the person sabotaging their plans is by hiring a bloodhound. This approach is effective for tracking and tracing, as bloodhounds are renowned for their exceptional sense of smell and ability to follow scents over long distances. By utilizing a bloodhound, they tap into a unique and reliable resource specifically trained for tracking, which distinguishes it from other investigative techniques. Such an animal can help them identify the saboteur by following the scent trail left behind, making it a proactive and direct method of uncovering the culprit. This stands in contrast to less effective options, such as setting a trap, enlisting police help, or conducting a public survey, which may not provide the same level of targeted investigation or immediate results in identifying an individual.