I'm not sure how "Two" could be the 1st instalment of a trilogy, but none-the-less I watched it after (my reviewed) "On the Run" (or 'One').
Hypochondriac compulsives always have the potential to make good comedy subjects and (can't remember the character's name) a possible cancer scare causes him to update his will and testament constantly on his portable voice recorder. Hiding his paranoia from his wife naturally causes erratic behaviour, and thinking a mistress being involved she employs a police friend to investigate.
It is weaker than the terrific thriller of On The Run, but this often farcical comedy of modern errors is fast-moving, tipping its hat occasionally to Jacques Tati and has frenetic and furtive people dashing about in cars. It all gets a little messy and complex and after a while the connection with On the Run blurs with this one.
Some scenes have been edited into 'Two' - unfortunately, they don't make any revelations but, neither do they detract. It's actually a good way to re-use locations (the alpine lodge, for example), cars even and many props and of course, actors. This allows cross-continuity but might all seem a just a bit too clever.
I'm looking forward to the 3rd part (Afterlife) to see how this aspect gets taken further and hopefully, to see another terrific film in its own right.