Hallie and Ella are so excited when their grandma and grandpa come to visit. While the grandparents are on holiday, they stay in a caravan-a small house on wheels-right outside the family home. One night the sisters get to sleep overnight with grandma and grandpa. The kids gather their sleeping bags and pillows and settle in, falling soundly asleep. But a loud noise wakes the girls in the middle of the night. As they attempt to raise their grandfather, Hallie and Ella discover the true source of the strange sound and other interesting facts. They're Here! is a picture book for children that shares a heartwarming and silly story of two sisters and their adventures with their grandparents.