"Adalynn" is a really well done psychological thriller that is engrossing, anchored by a very strong performance by Sydney Carvill as the titular character.
"Adalynn" begins as Adalynn and her husband Bill return from the hospital with their new infant daughter. We learn right away (in consistent voice-overs by Adalynn and her actions) that Adalynn has some mental issues which seem to be getting acerbated due to post-partum issues. She convinces her husband to go to a conference, saying that she can take care of their new child, and he reluctantly does. But alone, Adalynn begins to descend more and more into instability which may be made worse by events, either real or imagined...
One of the things I like about "Adalynn" is that it doesn't try to trick us -- it puts its cards on the table pretty early on and while it takes some zigs and zags to get the ending, it's never dishonest. And that makes it far more intriguing and disturbing than it might have been otherwise. The performances are uniformly excellent, especially (as I mentioned previously) Ms. Carvill, who is on screen for almost the entire film. And I really like that the movie actually fully explains what's going on at the end.
Pretty strong recommendation on this one from me.