Camp Lake by John A. Heldt

Phoenix, Spring 1983. For the Carsons, five siblings from the present day, it has come down to this. Find the parents they have chased through time for more than two years or go home and resume their lives without them. While Adam and Greg remain in Arizona and Natalie searches the country for leads, Cody and Caitlin travel to a summer camp in Maine, where their mother and father met as counselors. The twins, now 19, hope to intercept the older versions of their parents even as they work beside the younger ones. All of the Carsons prepare for a reunion that seems inevitable. Then tragedy strikes one family member and seductive strangers pull two others in unhelpful directions as a summer of promise turns into one of uncertainty and sacrifice. Filled with humor, romance, and heartbreak, CAMP LAKE, the poignant conclusion of the Carson Chronicles series, follows the lives of several spirited adults as they confront choices and change the era of big hair, space shuttles, and video arcades.