Ada ( Kate Beckinsale ) is a single mother living in East London with her adorable Deaf daughter Charlotte (Isabelle Moxley) — but she has a dark past, and in “ Wildcat ,” we first meet her not on the school run or at a parent-teacher evening, but in the middle of a high-stakes diamond heist. In this passable caper from director James Nunn and writery Dominic Burns, she’s the leader of a small and slightly odd crew comprising her handsome American ex Roman (“Mortal Kombat” star Lewis Tan), safe pair of hands Curtis (Bailey Patrick) and her vulnerable livewire brother Edward (Rasmus Hardiker), who will later be blessed, insensitively but not inaccurately, with the nickname Looney Tunes.

The essential plot of “Wildcat” is not unusual: A loved one is kidnapped, and the hero must comple

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