A Handful of Time [first edition]

When Patricia's mother sends her to her cousins' cottage for the summer, Patricia doesn't want to go. She doesn't know her cousins at all, and she's never been good at camping or canoeing, let alone making new friends. When she arrives at the cottage, her worst fears come true: her cousin Kelly teases her; Aunt Ginnie and Uncle Doug feel sorry for her. She doesn't fit in. Then Patricia discovers an old watch hidden under a floorboard. When she winds it, she finds herself taken back in time to the summer when her own mother was twelve ...