Trixie Belden #8 - The Black Jacket Mystery - 1961
Dan Mangan comes to town and he appears to be a bully. He will be living and working with Mr. Maypenny. However, the Bob-Whites think the new kid is nothing but trouble.
Naturally, Trixie becomes suspicious of who Dan really is and if he's responsible for some bad things that have started happening around Sleepyside.
In another storyline, a catamount is loose on the Wheeler's game preserve. Is the gang safe when they go horseback riding? Just another mystery for the B.W.G.s to try and solve.