Racing a Dog Star — Richard Prosch

Flung headlong into the Dog Days of summer by multiple mysteries that may or may not be related, Jo Harper and Frog Carpenter face:

An uncanny schoolmaster!
A bubbling, bucking Model-T!
Rattlesnake danger!
Old West outlaws!
and the worst thing of all...the first day of school!

In this sequel to WAITING FOR A COMET, Jo, Frog and sure-shootin' lady Constable Abby Drake return for another visit to the exciting town of Willowby, Wyoming in the hot, dry summer of 1910.