Remember that Peaky Blinders: Mastermind debuted on Valve’s digital distribution service in Summer 2020. The game has not received a discount as part of the current winter sale and 30th of December was withdrawn from sale.
As for the console versions, digital editions are still available for PS4 and Nintendo Switch (the game is also sold on the PS Store 89 percent discount), and here is the Xbox One variant Microsoft store no longer available.
The official reason for the removal of Peaky Blinders: Mastermind from sale is not given: the publisher of the project, represented by Curve Games, has not yet commented on the situation, but it is assumed that the company has problems with the license had.
Peaky Blinders: Mastermind was billed as a prequel to the show’s first season. According to the plot, Tommy Shelby had to uncover a sinister conspiracy and prove he was worthy of becoming the leader of the Peaky Blinders.