It's a coincidence that it's first standalone story in a series run that's been compromised of two-parters thus far. But as a consequence, writer Mark Gatiss gives himself a lot of work to do, to set up, explore and pay the episode off. Unfortunately, I found it a bit of a muddle.
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https://jira.atlassian.com/browse/BON-36502
https://jira.atlassian.com/browse/BON-36503
https://jira.atlassian.com/browse/BON-36504
