After Sherlock is shot, John moves back into Baker Street. They spend the autumn together as John tries to make sense of his life and make some important decisions about both Mary and Sherlock. Canon-compliant, excerpts from His Last Vow.
"The breakdown: 35. Canuckian. ESL professor. Choir conductor. Former/now part-time classical singer. Writer. Extreme Geek. Diehard Johnlock shipper. Not a fan of Mary, at all. Firm believer that Mary needs to face justice for her many crimes and to do it elsewhere, and the sooner her departure comes, the better."
Balm for the soul for those frustrated by BBC Sherlock's S3. "Act IV" follows the events as John moves back into 221B after Sherlock's shooting. Mycroft is involved in determining "what to do about Mary".