Highlights from the Second Episode of Season 2 of Elementary

Sherlock (Jonny Lee Miller) sets out to solve the murder of a mathematician as well as the purpose of the highly-guarded equation he was trying to decipher. Photo: Mark Schafer /CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved

Holmes (Jonny Lee Miller, left) and Watson (Lucy Liu, right) set out to solve a murder when a well-respected mathematician is killed in cold blood. Photo: Mark Schafer /CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved

Sherlock (Jonny Lee Miller) sets out to solve the murder of a mathematician as well as the purpose of the highly-guarded equation he was trying to decipher. Photo: Mark Schafer /CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved

Watson (Lucy Liu) works to help solve the murder of a well-respected mathematician who is killed in cold blood. Photo: Mark Schafer /CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved

Holmes (Jonny Lee Miller, right) and Watson (Lucy Liu, left) set out to solve a murder when a well-respected mathematician is killed in cold blood. Photo: Mark Schafer /CBS ©2013 CBS Broadcasting, Inc.

Holmes (Jonny Lee Miller, right) and Watson (Lucy Liu, left) set out to solve a murder when a well-respected mathematician is killed in cold blood=. Photo: Mark Schafer /CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved

Sherlock (Jonny Lee Miller) sets out to solve the murder of a mathematician as well as the purpose of the highly-guarded equation he was trying to decipher. Photo: Mark Schafer /CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved

Sherlock (Jonny Lee Miller) sets out to solve the murder of a mathematician as well as the purpose of the highly-guarded equation he was trying to decipher. Photo: Mark Schafer /CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved

Watson (Lucy Liu) works to help solve the murder of a well-respected mathematician who is killed in cold blood. Photo: Mark Schafer /CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved

Sherlock (Jonny Lee Miller) sets out to solve the murder of a mathematician as well as the purpose of the highly-guarded equation he was trying to decipher. Photo: Mark Schafer /CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved

Sherlock (Jonny Lee Miller) sets out to solve the murder of a mathematician as well as the purpose of the highly-guarded equation he was trying to deciphe. Photo: Mark Schafer /CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved

Sherlock (Jonny Lee Miller) sets out to solve the murder of a mathematician as well as the purpose of the highly-guarded equation he was trying to decipher. Photo: Mark Schafer /CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved

Sherlock (Jonny Lee Miller) sets out to solve the murder of a mathematician as well as the purpose of the highly-guarded equation he was trying to decipher. Photo: Mark Schafer /CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved

Joan (Lucy Liu, right) is conflicted when Joey Castoro (Jeremy Jordan, left), the son of a former patient, approaches her for a loan. Photo: Patrick Harbron /CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved

Joan (Lucy Liu) is conflicted when the son of a former patient approaches her for a loan. Photo: Patrick Harbron /CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved