Riddles of Love — Judy Baer

Searching for love...
When Darby Sutton's grandfather died, he left behind a very unusual will. To claim her inheritance, Darby must solve a series of baffling riddles. And there is only one person who may be able to help: her grandfather's bold young neighbor, Alex Colton.

Shy Darby just doesn't feel comfortable working with Alex, though. She's always been secretly jealous of his close friendship with her grandfather, and now she feels overwhelmed by the super-confident, handsome boy. But as they spend time together solving the riddles, Darby discovers that her hasty judgment of Alex was very wrong. Will she be able to claim Alex's heart before their search is over?