Amanda can't believe Jason, her new lover, is already cheating — they've only been a couple for seven months. But her domineering older friend, Christine, has "proof" and insists Amanda should take it seriously. Knowing Jason spoke with a woman in the mall food court and another in the grocery store, however, isn't exactly an iron-clad case.

But when she hears rumors about a different woman stalking Jason at his workplace, Amanda reluctantly finds the evidence sufficient to allow her boyfriend to be tailed... provided Christine and her posse of amateur detectives can be discreet. Unfortunately, Christine's idea of discretion is akin to blowing up a billboard.

The more Amanda learns about Jason's unusual behavior, the more their recently shaky communication crumbles. Unable to resist the momentum of the mounting case, Amanda finally joins the investigation and stakeout.

Does Jason have the seven-month itch? If he does, which tramp might be scratching it? And is it remotely possible for their relationship to grow even closer despite the clumsiest surveillance efforts bossy Christine can devise?