There are 2 books in the Agents of the Crown series. The newest book is How to Marry a Marquis which came out in 2005.

1
To Catch an Heiress

Book cover of To Catch an Heiress

When Caroline Trent is kidnapped by Blake Ravenscroft, she doesn't even try to elude this dangerously handsome agent of the crown. After all, she's been running from unwanted marriage proposals. Yes, Blake believes she's a notorious spy named Carlotta De Leon, but for six weeks until her twenty-first birthday, when…

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2
How to Marry a Marquis

Book cover of How to Marry a Marquis

The second of a funny, fast-paced, Regency-set duet from Julia Quinn, the bestselling author of the global phenomenon Bridgerton

When Elizabeth Hotchkiss stumbles upon a copy of How to Marry a Marquis in her employer's library, she's convinced someone is playing a cruel joke. With three younger siblings to support,…