King of Thieves (2018):
Getting it out of the way, this is not about Robin Hood or Ali Baba. It's a heist film based on the 2015 Hatton Garden Safety Deposit Box Burglary in London, supposedly "the largest burglary in English history". And it brings together a pretty impressive cast for this purpose, including the likes of Michael Caine, Jim Broadbent, and Michael Gambon. We start off with Caine's character melting a bunch of gold before going out on the town with his wife, who towards the end of the outing is implied to be in failing health and prepping for a hospital visit the next day. She excuses herself for a moment...and the scene cuts to the reception at her funeral service wherein we meet the rest of the cast, mostly elderly crooks reminiscing about their old heists, to Caine's mild frustration (his wife having warned him against falling back into old habits during her brief screentime, and him feeling that bragging about crime at her funeral was disrespectful).
Shortly after the funeral, a younger bloke visits Caine and tells him about how he has the means to rob Hatton Garden and is hoping that Caine can help him with a crew. Caine - evidently having, between scenes, gotten over his reluctance to disrespect his wife's memory by returning to crime - helps him case the joint before reaching out to the rest of the main cast.
To spare you the details, the first half of the film consists of them prepping for and perpetrating the crime, and the second half consists of a few members trying to muscle and cheat the rest of the crew out of their share of the score, ignorant to the fact that the cops have IDed the lot of them as the perps and are both following them and collecting evidence to prove it.
Now for the bad news: The film is poorly paced, not especially well written, and tonally confused. It's too dramatized to feel like it's supposed to be based in reality. There are moments early on that suggest that they might have wanted to be more comedic (a guy's hearing aid being so bad that they needed a walkie talkie to get his attention when he was sitting one chair over, the lookout repeatedly falling asleep on the job...), but the moments aren't funny they're just...there. The latter half of the film feels like it's trying to be more of a thriller, but frankly it's not tense enough to make that work. The characters are neither compelling nor particularly likeable, and a lot of the elements that feel like they should be important to the themes or characters end up going absolutely nowhere. Eg, considering the build up with Caine's late wife, you expect Caine's grief to play a major role for his character, much like as it was with Carl in Pixar's Up. But it never goes anywhere outside of a very rare comment that she'd be upset. You could literally have cut out the prologue and lose nothing because the build up is completely unnecessary for how "Caine's wife is dead" is employed. From the setup you presume that there is supposed to be either some tragic or transformational arc for him, but it just never happens. And that's pretty emblematic of how the film is written.
So my advice is to pass on this one. If you want to see something in a similar vein, watch Going in Style instead. While that's certainly no masterpiece either, it still had a tighter narrative, better pacing, a more endearing cast, and a more engaging heist.