After a child in a day-care center dies of a virus, Briscoe and Curtis try to find the source of the infection, leading to a case involving an extramarital affair, embezzlement and a drug manufacturer.

Chris Lutkin, David Dossey, David Zayas, Dennis Creaghan, Dylan Baker, Gregory Northrop, J. Smith-Cameron, J.P. Linton, Jack Gilpin, Jeff Marchelletta, Jim Gaffigan, John Berg, John Griesemer, Karen Culp, Kent Cassella, Marianne Hagan, Penny Balfour, Sally Stewart