Unfortunately, Detective Bar Answer 探偵バー アンサー seemed to have closed down some time between May 2021 and June 2022. The space has been replaced by a bar called Banana.
BTW, if you want a virtual tour of the detective bar, there is one - look for it near the Shinjuku Washington Hotel here:
https://maps.app.goo.gl/zEHbtc1BtXt6NZXU6?g_st=ipc
Considering that they have been around in that location since 2009, it’s been an amazingly long run for the area, considering the ephemeral clubland nature of Roppongi/Azabu.