"The book, by Agatha's own admission, was not one of her favourites, and we've taken some monstrous liabilities with it." (Behind the scenes: The Mystery of the Blue Train, 2006)Guy Andrews wrote four scripts for Poirot: The Mystery of the Blue Train and Taken at the Flood for Series Ten (2005-2006), Appointment with Death for Series Eleven (2008), and The Labours of Hercules for Series Thirteen (2013). He is known for the mini-series Lost in Austen, Blandings and Prime Suspect 5: Errors of Judgement. The first two demonstrates that he is entrusted with adapting other literary classics (Jane Austen and P. G. Woodehouse), and in Lost in Austen I'd say he succeeds, at least within its genre of television. Prime Suspect, the award-winning and exceptional series starring Helen Mirren, proves that he masters the crime genre, and his episode is actually rather good (Prime Suspect 5 won and Emmy for Outstanding Miniseries).
I have a very conflicted view of Guy Andrews screenwriting abilities on Poirot, as my episode-by-episode reviews can testify to. The quotation above sums up his approach to the source material - 'monstrous liabilities'. Appointment with Death is easily my least favourite Poirot episode (or at least it would have been if it hadn't been saved by an excellent soundtrack, location and production design). Taken at the Flood is passable, but the whole point of the title and the murder is lost in transition from page to screen. The Mystery of the Blue Train is, again, simply saved by great actors and a beautiful location. Only The Labours of Hercules manages to succeed, and I think that's simply because 'monstrous liabilities' was the only thing we could expect. I'm merely impressed by the fact that he actually managed to create something that almost makes sense and tie up some loose ends in Poirot's life.
However, I say I'm conflicted, and that's because I realise that he's been given some of the most challenging adaptation tasks. Appointment with Death is the only exception, really, and I offer no apologies for that particular adaptation. Yes, it's filled with internal monologues and overheard conversations, but look at what Nick Dear managed to do with The Hollow, an intensely internal novel, or Kevin Elyot, with Five Little Pigs.
Now, back to the adaptation challenge and why Andrews should be allowed at least a little leeway. The Mystery of the Blue Train is not one of Christie's best novels, and the team had already adapted the short story on which the plot is based, 'The Plymouth Express'. So changes were, indeed, necessary. Without any knowledge of Christie's novel, the adaptation works, for the most part, for a 'modern' audience. And I'm glad he took the opportunity to emphasise Poirot's increasing loneliness by the end of the episode (though I feel certain that's Suchet's doing). Taken at the Flood suffers from ITV's insistence on keeping the adaptations in the 1930s, which meant the war background was lost in Andrews' script. So the fact that it doesn't completely work isn't entirely Andrews' fault. And once again, he manages to develop Poirot's character by emphasising the hints of Catholicism in the source material (but I think we can thank (?) Suchet for that, too).
The Labours of Hercules was the surprise of the bunch for me. Remember, this is a collection of twelve more or less unrelated short stories - an almost impossible task for any script writer and possibly the most difficult of all the Poirot adaptation (with the exception of The Big Four, perhaps). Yes, the Mexian stand-off in the denoument scene and the melodramatic final lines between Poirot and Marrascaud ('I shall not hide' etc) are over the top. And it's disappointing that so many of the short stories are left out. Not to mention the fact that it stretches credibility more than a little that all these people just happen to be in the same hotel (but, to be fair, so does the premise that Poirot just happens to stumble upon a series of cases, in the right order, that resemble the mythological Labours). However, as I've tried to demonstrate in my episode-by-episode review, the atmosphere and character study more than makes up for any plot niggles, in my view.
To summarise, Andrews is not my favourite of the Poirot script writers. He takes too many risks and the changes tend not to work - unfortunately. But his adaptation of The Labours of Hercules manages to redeem his reputation somewhat, and I think he should be given some leeway for being handed some of the more impossible novels.