Golden Age Quickie

ACROSS
2. Nick and
4. Mencken's Mask mag
7. Chandler's business (1939;1950)
8. Sayers's Lord Peter
9. Anthony Berkeley's club (b 1928)

DOWN
1. Nickname of Anne Hocking
3. Cain's Mildred
4. Christie's first short (unpub), The House of ______
5. Ronald, the rules maker
6. Christie's detective couple