Note: This whole case happens 2 years after the events of DGS1, and digging up Colette’s past is one of the key acts needed to piece all the mysteries together that aren’t addressed by the time a case involving the World Fair occurs in the year following DGS1. What’s important about the DGS equivalent of A Scandal in Bohemia isn’t necessarily the investigative case itself, and instead, is what happens as a result of that case.
(Examples of prominent changes include the nature of the relationship between the lawyer and DGS Irene, which stays platonic as here the lawyer ends up being same lawyer who ‘betrays’ Barok van Zieks, and to return a favor, Irene helps this lawyer back to Japan. The wedding witnessed turns out to be between Colette and Benjamin, with confusion being set due to the fact that Colette is intentionally dresses up to look like Irene to help her throw everyone off, as Irene and that lawyer’s trip to Japan is moved up when Sherlock’s ‘King client’ enters the picture.
Meanwhile, Benjamin is implied to be intentionally killed off due to him holding the blueprints to the clock tower housing Big Ben, as well as him unintentionally taking the job position that Professor Moriarty was originally going to place one of his own people in.)
(...Err, I do have an in-progress timeline, but seeing how it covers events prior to this case and not this case itself, I don't feel like it's appropriate to include at this time. Maybe in a following post if people are interested?)