Mary Downing Hahn

When their mom remarries, Molly and her brother, Michael, try to make friends with their new stepsister, Heather. But Heather only wants to make trouble for them. She lies and tattles and misbehaves, and somehow they always get the blame. They know she's trying to drive a wedge between her father and their mother so she can have her father all to herself--and it seems to be working. Then, Heather starts playing in the graveyard behind their new house....

When thirteen-year-old Ali spends the summer with her aunt and cousin at the family's vacation home, she stumbles upon a secret that her mother and aunt have been hiding for over thirty years.

In the nineteenth century, ten-year-old Florence Crutchfield leaves a London orphanage to live with her great-uncle, great-aunt, and sickly cousin James, but she soon realizes the home has another resident, who means to do her and James harm.

Travis and his sister Corey decide to boost business at their grandmother's Vermont inn by staging a few "hauntings" that soon draw tourists from across the country, but when their antics awaken a dark force, they must find a way to put to rest the ghosts they have disturbed.

While staying at the remote and reputedly haunted Maine inn run by her father and pregnant stepmother, sixteen-year-old Cynda feels increasingly isolated from her father's new family and finds solace in the attentions of a charming but mysterious guest.

"When unlikeable Elsie dies in the influenza pandemic of 1918, she comes back to haunt Annie to make sure she'll be Annie's best--and only--friend soon"--