At the Future Games Show, a trailer with a few more details about Sherlock Holmes Chapter One was revealed. In it, you play as a young 21 year-old Sherlock Holmes as he tries to solve various mysteries on a Mediterranean island.
In Chapter One, Sherlock Holmes is returning to this island, the one he grew up on, to try to solve the mystery of his mother's death. As this is Sherlock at only 21 years old, we get to see him before he established himself as the legendary detective we all know. His lack of experience and arrogance are sure to show up.
In an expansion on their previous Sherlock Holmes games, Frogwares describes Chapter One as an open-world detective game with "global investigation." Global investigation means that everyone and everything on the island is potentially someone with information or evidence. You can talk to random folks on the streets for directions or to ask pointed questions that may help your investigation.
To that end, you'll have a few tools to get that information. You can find different disguises that may persuade someone to open up to you, or you may have to resort to some violence. And, of course, deception and deceit will be powerful tools.
One big thing is that there is no John Watson, but there is a Jon. Jon accompanies you, and just like Watson, serves as a sounding board for Sherlock as he works through the case. Part of the mystery of Chapter One is learning just who Jon is really.
Sherlock Holmes Chapter One is coming to PlayStation 4, Xbox One, PC, PlayStation 5, and Xbox Series X in 2021.