Here’s the synopsis, via Wikipedia:
After the demise of his partner turned enemy Steve McKenna (Ben Foster), Arthur Bishop (Statham) who narrowly escaped from Steve’s murder attempt on him retires his status as a contract killer. But when his most formidable foe kidnaps the love of his life, he is forced to travel the globe to complete three impossible assassinations, and do what he does best, make them look like accidents.
This is a sequel, but the first sentence of that synopsis actually explains everything you need to know about the previous film. Seriously. The whole thing can be summed in that many words.
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