Kara has been a steadfast support for her boyfriend Tyler, helping him recover from a difficult period in his life. They are on the verge of marriage, and everything seems ideal until Tyler’s former girlfriend, Isabelle, reappears after completing rehab, determined to reclaim her life, starting with Tyler. Kara feels instantly threatened by Isabelle, who embodies qualities she lacks—she’s alluring, bold, and outspoken. To Kara’s dismay, Isabelle begins to weave herself back into Tyler’s life, raising Kara’s fears that he might revert to his old ways. As Kara’s world begins to unravel, she suspects that Isabelle might be responsible for the menacing threats she has been receiving. What begins as Kara’s effort to preserve her relationship and the life she and Tyler have built spirals into a sinister game of cat and mouse, as she struggles to withstand the vengeful jealousy of the “wicked” ex-girlfriend.