WARNING SPOILER ALERT!
Could have been 3 stars until we got to the ending, which was so utterly preposterous that I nearly gave it a single star for ruining the story.
Why?
1) we're supposed to believe that she can drive off a drawbridge while it was elevated, like Evel Knievel, then impact the river below, without wearing a seatbelt and somehow swim free because she left the window open. Meanwhile, the psychopath in the passenger seat dies because he can't get his seatbelt undone. That's ballpark around a 150 foot freefall, with an impact of around 65 mph for her to get slammed with (don't ask me, I'm relying on others' data). And that's on top of broken ribs and numerous other injuries. And the car falls level into the water rather than cartwheeling over.
2) okay, she's young (although unhealthy thanks to years of heavy drinking and living on the streets) so maybe she does manage to swim away without anyone noticing her breaking the surface. But that doesn't explain the even bigger flaw in the story. When the police drag the vehicle out from the depths they find the body of Phillip, the enforcer, in the trunk. How did it get there?
He's repeatedly described as a mountain of a man, a giant, King Kong, etc. So, he's a massive deadweight of several hundred pounds. He finally dies in the house yet somehow his body makes its way out into the trunk of his car. As noted, Alice is severely battered and bruised even before their final encounter. She gets a dozen bleeding cuts on her hands and arms just breaking in, then gets a knife slash across her shoulder that left her arm numb. She finally outlasts him. Delilah and Elton are both at death's door from being slashed and beaten up by Phillip before her arrival. Delilah is bleeding profusely from a head wound and is barely conscious.
To quote the story: "She tried to dig into his back pockets but he was too big, too heavy. She stood up, grabbed one of his massive arms and pulled - her rib popped and flared, and she dropped his arm with a violent gasp. She took a breath. Tried again, and finally managed to flip the man onto his stomach."
Mind you, she's already called 911 and she can hear the sirens coming. Yet somehow she and Delilah, a barely conscious little mouse of a teenager, manage to pick up the behemoth and carry him out of the house and up into the trunk of his car. You read that right. She can barely even get the body to flip over because he's so big, but then a woozy, bleeding teen girl helps and they're able to cart him out of the house and she makes her escape before the authorities arrive.
So, a halfway decent story ruined by an utterly ridiculous ending.