Radio Boys in the Secret Service by J. W. Duffield

Twin sixteen year-old brothers, Guy and Walter Burton are the “Radio Boys” headed for another adventure. Travels take Guy from their home in New England to London where he meets another radio enthusiast, Glennon. There are city adventures before they find themselves on an old steamer headed for disaster. Can the wireless radio help them in their time of need? And, where is Walter? - Summary by Larry Wilson