The acting was definitely top-notch. Even by actors I've never seen before. Kudos to M. T. Vasudevan Nair on adapting Daphne du Maurier's 'No motive' for mallu screens(a quick wikipedia search revealed that btw).
Matt Damon has always been a Matt Damsel-in-Distress(except as Bourne)! It seems the US Govt has been saving his ass since world-war II, lol. Heck, even Robin Williams(RIP) saved him once, from himself! Haha