In her haste to flee to New Zealand, Ally has left behind a flat strewn with her old stuff and told Cath to "take anything". She means her tops and make-up, not her whole identity, but when Cath finds a folder in the bin with her CV and med school degrees all bets are off.
Don't let the BBC logo, competent acting and moody lighting fool you – this is basically a mad Shortland Street storyline that's been condensed into miniseries format. Not that that's necessarily a bad thing, the madder the better I say, but it's important to approach these things with some perspective.
As for the identity theft, it does seem to have some advantages. After memorising her new CV and watching a couple of YouTube surgery tutorials, Cath / Ally waltzes into a job at a hospital in Edinburgh, then starts dating a Scottish doctor who's way hotter than her ex. Maybe I move to Australia and steal the identity of a top investigative journalist?
Below the surface, though, it's all a living stress dream. In one horrific scene worthy of a Saw movie she accidentally resets a man's badly broken ankle without any pain relief; in another she actually says "oops" while slicing into a man's abdomen. It can't be good for you, being this under the pump all the time.
I'll keep watching, because I want to see what happens when her boyfriend tells his doctor mates about her and they go "oh yeah, didn't she move to New Zealand to be with a hunky sheep farmer?" But identity theft? Seems like more trouble than it's worth. Not the scam for me.