SOLVED. YA Sci-Fi Mystery - A group of kids get separated by a teleportation device and have to find their way back to each other. Read 2011-2012.

[Lumi]

No Passengers Beyond This PointSo this book I'm looking for I remember reading in 5th grade in 2011-2012 as a group reading assignment. It was published under Scholastic and I remember seeing it at my school's Scholastic Book Fair that same time.

I don't remember the any words in the name or the author. It was published in English and in the US by Scholastic. I've tried to search Scholastic's website to see if it's still listed but I couldn't find it unless I'm not looking in the right place. I've also tried to search on my old school's library card catalog but it's not there either.

As for the plot, I remember there being a group of maybe 3 or 4 siblings--two girls and a boy I want to say. They get teleported away from each other and they have to find their way back. I don't remember how they found this teleportation device but I want to say it was like a doorway type of device.
I remember one scene specifically where the youngest sister was teleported to a room that was filled with tree canopies and she had a caretaker with her. The caretaker encouraged the sister to keep climbing the trees to find a safer sleeping spot among the trees.

As for the characters, I for sure remember the youngest sibling was a young girl about 6-8 years old. There was also a middle brother and an older sister.

The cover, however, I remember distinctly. It was a swirl of blues and greens and in the middle was a doorway tilted a little bit.

A little extra information:
The book had short chapters, 2-5 pages and the chapters switched between the perspectives of the siblings.

That's everything I remember about this book but if there's any questions, I'll try to answer them as best as I can!!

[Lumi]

Solved! It was No Passengers Beyond This Point by Gennifer Choldenko!No Passengers Beyond This Point