CSI Penny Gill discovers a small, micro-crocheted koala paw at the crime scene.

It is revealed that Lindsey left the world of forensics (a path she originally took to fulfill her mother's dream) and has been working a job Catherine heavily disapproves of.

Franchise creator Anthony Zuiker met with actress Marg Helgenberger months in advance to map out the narrative. They wanted an episode that pushed Catherine into a raw, deeply personal headspace.