Books like 13 Little Blue Envelopes

Inside little blue envelope 1 are $1,000 and instructions to buy a plane ticket.In envelope 2 are directions to a specific London flat.The note in envelope 3 tells Ginny: Find a starving artist.Because of envelope 4, Ginny and a playwright/thief/ bloke about town called Keith go to Scotland together, with somewhat disastrous though utterly romantic results. But will she ever see him again?Everything about Ginny will change this summer, and it's all because of the 13 little blue envelopes.Ages 12+"