In alternating chapters, two teenagers describe how their feelings about themselves, each other, and their families have changed over the years.

Streetwise stray dog Mr. Whiskers and sisters Misty and Zelda follow clues through the streets of San Francisco in their search for the sibling's kidnapped father.

Gravity becomes a very personal problem for Leda as she stumbles and tumbles through a long day.

In the final mystery of this series, one of the bad guys has finally caught up with the skateboarding sleuth of Santa Marina and worse, landed her in the hospital out cold. This time Sammy's family and friends must solve the crime – who did this to her and why? In a heartwarming, fitting finale the people whose lives she has impacted over the years come together to help uncover the truth and save their beloved Sammy.