The Case Of The Reluctant Carpenter is a Sherlock Holmes television movie from 1955.
It stars Ronald Howard as Holmes, H. Marion Crawford as Dr. Watson and Archie Duncan as Inspector Lestrade.
A series of bombs go off in London over a period of time, with the culprit looking to obtain money from the authorities if they want him to stop.
As always, Holmes solves the case, in this case because analysis of mud from a pair of boots leads him to a particular location.
Movie pages here.