I almost bought tickets to see this on the big screen... The basic idea seemed promising – a father-and-son team of killers who manipulate their female victims into taking lethal doses before drowning them in bathtubs to stage it as suicides. Shawn Ashmore is generally quite pleasant to look at, so I figured it might be worth checking out. But no, it really isn't. It’s dreadful. Ashmore plays "Jeff," a detective whos…