If you like Elsewhere by Will Shetterly

Elsewhere is so original,I had to really think about what books might be like it. Here are a few
suggestions:

Thief in the House of Memory by Tim Wynne-Jones.
The death of an apparent stranger in the Steeple family's old home
triggers troubling questions for sixteen-year-old Declan as he tries to make sense of his fragmented dreams, random memories, and unexplained coincidences, hoping to learn the truth about the mother who suddenly left when he was ten.

Waves by Sharon Dogar.
While spending the summer with the family away from his comatose sister, Hal discovers their bond is stronger than he thought as her visions begin to fill his head and the truth surrounding her accident becomes clearer with every passing day. (This one is brand new, and I'm reading it right now and enjoying it!)

The Truth About Forever by Sarah Dessen.
The summer following her father's death, Macy plans to work at the
library and wait for her brainy boyfriend to return from camp, but
instead she goes to work at a catering business where she makes new
friends and finally faces her grief.

Where I Want to Be by Adele Griffith.
Two teenaged sisters, separated by death but still connected, work
through their feelings of loss over the closeness they shared as
children that was later destroyed by one's mental illness, and finally make peace with each other.