Alice is now in a mental institution and Luther,after a failed suicide attempt,returns to work having been cleared of killing Zoe. Assisted by the loyal Justin he joins a team headed by Superintendant Schenk hunting a masked serial killer. Luther pursues a suspect,failed art student Cameron Pell,who escapes after attacking him and later phones to say he wants to emulate the Victorian killer Spring-Heel Jack. Luther also agrees to help Caroline Jones,widow of a man he once arrested,to stop her young daughter Jenny from appearing in hard core sex films and kidnaps the girl from a film set.
