Nearly all the spooky bits are achieved by pure aural assault, and the characters are such stock types, haunted by such predictable backstories, it's like watching Solaris performed by sock puppets.

Tosses out a lot of potential what-ifs but never commits to any of them.

The film is a solid enough venture, and although it could have explored the characters' psyche more thoroughly, the fact that the ending is open-ended and leaves everything to the imagination serves the film well.

In the end, 400 Days is a good and compelling idea that has been disappointingly realised with a preposterous second half.