Where does Frost discover his sister's body in the novel, The Night Bird?

Frost finds his sister’s body in the backseat of a car parked near Ocean Beach. This shows that Night Bird has studied Frost, as well as his other victims, because he chooses to leave Lucy for Frost to find in the backseat of a car parked near Ocean Beach. The location was picked specifically to remind Frost of his sister’s death and raise his fear he will find Lucy dead.