There are 3 books in the Anna Blanc Mysteries series. The newest book is The Body in Griffith Park which came out in 2019.

1
The Secret Life of Anna Blanc

Book cover of The Secret Life of Anna Blanc
It's 1907 Los Angeles. Mischievous socialite Anna Blanc is the kind of young woman who devours purloined crime novels—but must disguise them behind covers of more domestically-appropriate reading. She could match wits with Sherlock Holmes, but in her world women are not allowed to hunt criminals. 

Determined to break free…
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3
The Body in Griffith Park

Book cover of The Body in Griffith Park
Los Angeles, 1908. Anna Blanc is a former so-so socialite, a flailing police matron, and a killer detective.

Ex-heiress, Anna Blanc, is precariously employed by the Los Angeles Police Department, reforming delinquent children and minding lady jailbirds. What she really wants is to hunt criminals and be alone with Detective…