The CSIs arrive to investigate the death of a man shot in front of his house. A woman runs towards the scene crying that the decease was her husband. Moments later, another woman also claims that she is the dead man's wife. It turns out that the three people were a committed threesome. The other case starts with the discovery of a woman dressed as a mermaid found inside the river.
Spoilers ahead. Coverage follows the scope labeled below.
Complete story — includes the ending
Two grieving widows arrive at the scene of a murder, both claiming to be the wife of the victim. Mac, Stella and Dr. Hawkes try to sort out the details when they discover that the women were knowingly involved in the marriage. A case personally affects Lindsay when she learns that a woman's body, tangled in kelp, strangled to death and dressed like a mermaid, is from her home state.