David Shelley, a former SAS soldier, seeks a quieter life in London after his covert military service. However, his plans are disrupted when Emma, a young woman he once protected, is found dead. The police deem it a suicide, but her parents refuse to accept this conclusion and enlist Shelley to investigate. As he delves deeper, Shelley uncovers Emma's entanglement in a perilous world of drugs and online pornography. This discovery propels him into a dangerous quest for retribution, challenging his abilities and confronting him with formidable adversaries.