Cart Before The Horse

This book is a clean Cozy Mystery short story that does not contain foul language, sexual situations, witches, or paranormal events.
Holly's old truck wouldn't start after hitching up the trailer to pick up a new schooling horse for Happy Hollow Stables. Her assistant, Mckenzie, recommended that she have the truck towed into the local mechanic in Hill City.
Once the mechanic completed his inspection, he explained that her truck was simply too old and not worth fixing and referred Holly to his business partner that sells used cars in the attached building.
Will the cost of a new truck be murder?