I read a series with a very similar premise ([book:The Face on the Milk Carton|19469], teen girl, raised in a happy family, finds out she was kidnapped, and her "real" family wants her back. The other series was 8+ years ago, but I've remembered it.

The MC here is a senior in high school, and that's probably the target audience. I'm a bit (ha) beyond that, but still enjoyed it. It hit on a lot of the emotion that all the individuals going through something like this might feel. Nothing completely black & white.  Happy enough ending, giving the premise. The "a stolen at birth novel" makes it feel (to me) like it's part of a collection or something, but it is a stand-alone, although the author had a bunch of other novels.  

The Kindle copy is included in KU, and Hoopla has the audio. My KU subscription ended before I wrote up my review (I like to have the text to reference if needed - but my bad).  Not sure if it's an Amazon exclusive, as the library/Libby doesn't have any copies. 

1st person/present tense. 38 chronological chapters/no headers. No profanity ... at one point something was described as a "a giant cluster" ...  and just ends there. ClusterF, that is used a lot ;)