Shadows over the harbour

Portsmouth, England, 1943. The fate of a Royal Navy ship hangs in the balance, and three teenagers are the only ones who know. When Lena overhears a whispered conversation and discovers a coded note tucked inside a library book, she has no idea she's stumbled onto something far more dangerous than she could imagine. Together with her friends Tommy and Elsa, she begins to unravel a sinister plot: someone is signaling to mysterious boats lurking outside Portsmouth Harbor, planning to sabotage...