Control-A will also work on certain browsers. The one that's not a townie is Big Lucy's Cabaret.
There's info galore about Big Lucy on the boards, 'specially here in the Newbies section. Basically, Big Lucy's Cabaret is a special feature available only to NY detectives. It's an old-time speakeasy, and changes locations with each detective's case. It has its own message board, market, and other things you can explore. However, once you open a new case, the Cabaret vanishes, and you can't access it again til you track Larry the Twerp down again.
Many people say it's not worth the money. However, there are things available there that may be of interest to you. Bottom line, if you're just starting out, it's best to wait a bit and build up your bank account. But as you gain a bit more experience and money, you may find certain things of interest there....;-)