No Time For Goodbye - Linwood Barclay

The house was silent. That was the first sign that something was terribly wrong. Fourteen-year-old Cynthia wakes one morning to discover that her entire family - mother, father, brother - have vanished. No note, no trace and no return. Ever. Now, twenty-five years later - with a family of her own - a letter arrives which chills Cynthia to the core. It leads her inescapably down the path to the devastating truth behind why they left. Sometimes it's better not to know...