Possible 2000 to 2010 YA Alien novel where aliens can create bubbles and float; Kids held against will; Kids not held try to free the kids being held; one or two word title; may be a series

[Charli]

Helping a friend find a book they either read in middle school or high school. Is pretty sure not post 2010.

* aliens can create bubbles
* aliens can float
* kids held against will with kids on outside trying to free them
* one or two word title
* May be a series