Holmes: Sherlock and Mycroft
I've been intrigued by this clever little two-hander since it first appeared in 2015. The title should be Sherlock versus Mycroft as the players each take on the role of one of the brothers, competing to solve the same crime.
This they do by questioning characters (taken from Arthur Conan Doyle's stories) to obtain evidence. The tricky bit is managing the game's mechanisms to get what you need at the right time. This is compounded by the random way the characters appear – and you've only got seven rounds to get it all done.
For 2 players, aged 10+, playing time 25 minutes: £18.00 (£15.00 outside the EU)