His Majesty's Submarine Unbeaten was last heard from via a signal sent to Flag Officer Submarines on November 1, 1942. The signal simply stated: "Operation Bluestone completed". After this date the 58-meter British U-Class submarine inexplicably disappeared. Unbeaten was fully operational for just over two years. During its short tenure, Unbeaten successfully returned to war-torn Malta many times, symbolically flying its Jolly Roger. Being Silent They Speak endeavors to highlight the varied triumphs, tragedies, events and sacrifices of submarine life during World War II. This meticulously researched true story follows Unbeaten through its build at Vickers of Barrow, its war deployment to Malta and back, and then on to the submarine's final departure from Holy Loch. The crew of Unbeaten were the last to see the legendary British submarine HMS/M Upholder before commanding officer Lt. David Wanklyn VC and his indomitable crew also disappeared forever.

Several submarines have had books written about them. Unbeaten's activities were no less daring than those of Upholder or any other submarine taking part in World War II.

Exactly 70 years on, this compelling and revealing book encompasses all of Unbeaten's war patrols and expands on its final clandestine tasking in November 1942. The account of this secret operation concludes with an extreme twist of fate, which could leave the final chapter open forever and the last crew of Unbeaten still on patrol.