Out of nowhere former District Attorney Samantha Simms (Meredith Monroe) receives a call from her ex, Brad (Rick Ravanello) in Seattle with bad news, her sister Brenda (Nicole LaPlaca) has been arrested for murder. Dropping everything and jumping on the first plane out there Samantha takes it upon herself to represent her sister and discovers that the dead man was a married man her sister had been dating, he was killed in a hit and run involving Brenda's car which she reported missing the day after it had been used in the hit and run. With past issues causing tension between Samantha and Brenda and Brenda hiding something the odds are against Samantha clearing her sister.
Strip away the names and the location and what you have left with "Secret Liaison" is a middle of the road, stereotypical made for TV thriller where a woman investigates a case to try and clear a friends name and finds herself in danger. Yes this time the friend is the sister but that only means we can have past family issues added in to the mix. Plus we have another cliche tossed in there as well because Samantha comes face to face with her ex, Brad the detective who is more than happy to assist his ex who he obviously still cares for. Trust me with this much cliche going on that "Secret Liaison" would need a miracle to end up anything more than average at best.
Unfortunately there are no miracles to save "Secret Liaison" with a regular bunch of characters who are forgettable played by a cast who in some cases I feel may have been cast as much for their looks as their acting ability. Not that anyone is really terrible when it comes to the acting as it is at the level which you expect from this sort of movie but it does mean that not a single member of cast impresses.
What this all boils down to is that "Secret Liaison" is nothing more than a typical made for TV thriller which involves a woman investigating a crime, getting in to danger and dealing with not only her feelings for a helpful ex but also old family issues.