Never let go is an intriguing, mentally draining psychological horror that quickly hooks you with a central question: is Halle Berry's character losing her mind, or is there something more sinister at play? It's a slow burn where you constantly have to guess what is real and what isn't. The premise is interesting, and for the most part, it keeps you engaged.
The biggest problem I had with the movie, however, would have to be the third act. Prepared to question all that's throughout, it feels like there wasn't much resolution at the very end. It doesn't have the closure I was looking for; instead, it just leaves us with more questions. Some people like that mystery, but for me, it was just the slightest bit more explanation or one additional scene needed to help wrap up things nicely.
That said, it's still worth watching, if not for any other reason than for those who love a good slow burn, psychologically thrilling plot. Just be prepared for an ending that may not be as satisfactory of a wrap-up as it could be.