Lisa Edelstein and Callie Throne have landed guest-starring roles on CBS' Sherlock Holmes adaptation Elementary, TVGuide.com has confirmed.  

As first reported by TV Line , the Housealum will play Heather Vanowen, the CEO of a high-end PR consulting firm who crosses paths with Holmes (Jonny Lee Miller) after her company was apparently the target of a bombing.

How Elementary won't go there with Sherlock and Watson

Meanwhile, Necessary Roughness star Thorne will play Terry D'Amico, the former partner of Captain Gregson (Aidan Quinn) who may have helped him imprison the wrong man years ago. TVLine.com first reported Thorne's casting as well.

Elementarydebuted last week to 13.2 million viewers and a 3.1 in the adults-18-to-49 demographic, winning the 10 p.m. hour in both measures.

Elementaryairs Thursdays at 10/9c on CBS.