A Body in the Trunk by Elizabeth Spann Craig

Sometimes taking a spin makes you crash and burn.

When a neighbor disappears, Myrtle and Miles shift gears and hit the road to search for him. They discover their neighbor slightly off the beaten track—murdered with a tire iron. Myrtle has no intention of letting the killer give them the slip. She and Miles buckle up for a race against time to find the murderer…before someone else hits a dead end.