Sections set in the present day feature Sophie Collingwood, book lover, and alternate with sections set (mostly) in the late 18th century and featuring Jane Austen. At the heart of both sections is the second edition of a book called A Little Book of Allegories by Richard Mansfield, a clergyman who's very important to Austen.
Sophie's love of books is encouraged by her uncle Bertram, who dies in mysterious circumstances. Sophie's convinced that he's been murdered, so she's determined to prove it, find the killer, and prove Austen's innocence at the same time. And if that's not enough, she finds herself being romanced by two very attractive men. Lovett has a bit of fun doing some parallels with Pride and Prejudice. Or that's how it seemed to me. I'm far from an Austen expert.
I found First Impressions charming and a great deal of fun. If you like books about books, then this is for you. The parts with Sophie and her uncle talking about books are irresistible. It's hard to pick a favorite, but I'm going with this one: