My Secret Guide to Paris: A Wish Novel - Lisa Schroeder

Nora loves everything about Paris, from the Eiffel Tower to "chocolat chaud." Of course, she's never actually been there -- she's only visited through her Grandma Sylvia's stories. And just when they've finally planned a trip together, Grandma Sylvia is suddenly gone, taking Nora's dreams with her.
Nora is crushed. She misses her grandmother terribly, but she still wants to see the city they both loved. So when Nora finds letters and a Paris treasure map among her Grandma Sylvia's things, she dares to dream again...
She's not sure what her grandma wants her to find, but Nora knows there are wonderful surprises waiting for her in Paris. And maybe, amongst the croissants and macarons, she'll even find a way to heal her broken heart.