Trixie Belden the Red Trailer Mystery (Trixie Belden, No. 2)

Trixie Belden and Honey Wheeler set out in the Silver Swan with Honey's governess, Miss Trask to find Jim Frayne, the runaway heir to a half a million dollar fortune. They become entwined in the lives of a strange family who are travelling in a red trailer. When their daughter runs away and Trixie and Honey discover that the red trailer, along with many others, has been reported stolen, the two girls become determined to find Jim and solve the red trailer mystery.