Paris For One

"John,
By the time you read this, a few months will likely have passed. Mycroft should have helped arrange your visit to Paris for me and I am so terribly sorry that I’m not able to take this trip with you as we had planned. If everything has gone according to plan, you should be sitting outside Le Café Pavilion next to the Seine with the Eiffel Tower in view across the river."
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Three months after Sherlock's death, John finds himself sitting at a café in Paris with two letters from his dead best friend. What they reveal to him is hope.