The Magic Half (Miri and Molly, #1)

Miri is the only single child in the middle of a family with two sets of twins--older brothers and younger sisters. When the family moves to an old farmhouse Miri accidentally travels back in time to 1935 only to discover Molly, a girl in need of a real family to call her own. A very satisfying classic-in-the-making, with spine-tingling moments, this is a delightful family-friendly middle grade time-slip novel.