Firstly, it is an excellent film; exciting, gripping and occasionally surreal. I really enjoyed the references to Alien as it helped to answer questions raised in that film. However, there were so many illogical holes in the plot and irrelevancies that the overall worth of the fim was devalued; it didn’t hang together well. Brilliantly directed and acted, it raised more questions (some of which are daft) than it answered. Altogether, it exceeded my expectations (having read some less than positive reviews) and I’m very glad I made the effort to go and see it.