If you like John Wick movies, you will love this one. It has a female version (she reminds me of Ziva from NCIS) of John Wick, titled Mother's Day. It's as dark, and gritty, but as entertaining as John Wick.
One reviewer compared it to Jennifer Lopez' 'Mother' because of the similarities in the plot, but this one is much better, and it's Polish.
So, go ahead and discover this movie before everyone else does, and be a hero among your friends for recommending it.