Fourteen year old Allison Timmons (Maddy Martin) and her half sister Sydni (Kirby Bliss Blanton - Suicide Note) are about to inherit millions as their mother died 3 years earlier and their father has just died in a plane crash. But following the funeral Allison receives a visit from her biological mother, Jessica (Karen Cliche - Damaged), who put her up for adoption when she had her years ago following an affair. Whilst Allison never knew her she welcomes her in to the family home despite Sydni and her Uncle Aaron (Brad Long) being suspicious of why Jessica has now made contact. And they are right to as Jessica's current husband has just been arrested by the FBI for investment fraud and now she wants a slice of Allison's newly inherited fortune and will eliminate anyone who might get in her way.
What do you do if you can't pay for your hotel bill? Wait for the manager to come up to your room, kiss him, slap him, rip open your top and scream for help. This is one of the devious things which Jessica does in "Killer Mom" and in truth it is one of the tamest things she does as she sets about using all her talents and connections to get what she wants, even if that means eliminating those who might cause her problems along the way. As such "Killer Mom" is very much all about watching how devious Jessica will become to get what she wants, which is quite simply the money and nothing else. And it is her wicked schemes which make "Killer Mom" entertaining from planting indecent images on computers to, of course, murdering someone who becomes wise to her plans.
But there is another side to "Killer Mom" thanks to the writing of the character Sydni as she is a bit of a rebel with a touch of the spoilt rich girl attitude yet at the same time she has a good heart. As such you expect the smart mouthed and cynical Sydni to be the one who wises up to Jessica's nefarious ways and sets about stopping her. What it means is that Kirby Bliss Blanton steals many a scene from Karen Cliche who delivers a modern twist on the classic femme fatale, right down to her look and evil glares.
What this all boils down to is that what goes on in "Killer Mom" is nothing new and certainly not to be taken as a serious thriller with an engaging storyline. But it is entertaining if you enjoy the sort of movie where you have an evil woman capable of all manner of evil and devious things to get their own way.