Another recent dvd purchase which I picked up at a local market for a couple of quid.
'Unknown' is about five men who wake up in a disused warehouse,suffering from various injuries and not knowing who they are or how they got there.
Over time,via a series of memory returning 'flashbacks',we learn who they are and how they relate to each other.
The film comes across as being similar to Reservoir Dogs & Memento (and so I've been told, SAW, which I havn't seen) and is another well made psychological thriller where no-one is quite who they seem to be.