A devoted wife suspecting infidelity poisons her children to hurt her husband and now she must right her wrong and conceal the truth when she later realizes her mistake.

Thanks jjb, I've taken some hints from your suggestion and actually come out with something different and hopefully better. at least i know now the concept of the story is realistic and that's a starting point for me. I learned today that the standard for a log-line is 25 words,sounds impossible when you have a lot of descriptions to give.

Timmyelliot, thanks for clearing my doubts, now i am confident i have a different story altogether.

*new*

Have a read of 'A Fraction of the Whole', a novel by Steve Tolz. Not only is it a ripping and hilarious black comedy, there is a sub plot that has similar executional elements to your idea.

I dare say the tone, characters etc would be very different, but the author pulls it off.

Re your log line, I like the concept, but I reckon the sub text of certain plot elements mean you can leave out some elements that are currently stated, and may be bogging down the log line... maybe something like:

Suspecting infidelity, a devoted wife slowly poisons her children to hurt her husband, on discovering his innocence, she must conceal the truth to save her family and stay out of jail.

But I'm knew to this... so feel free to disregard completely!