Living in reclusion, a retired Sherlock Holmes feels useless and irrelevant and slips slowly into an atrophying melancholy until a nefarious woman from his past shows up unexpectedly at his doorstep and draws him into a new adventure. Against the backdrop of the First World War and the unrest in both England and Ireland following the Easter Rising revolt, a simple task becomes ominously complicated and dangerous at every turn - nearly as complicated...