When the home security alarm awakens Cait Pepper in the middle of the night, she assumes there are bugs in the new system but has it checked out the following day. The security technician finds a halberd--a Shakespearean weapon--and knife on the ground which are construed as evidence of an attempted break-in. Cait recognizes the knife. She shot and killed the bank robber who owned the knife two years ago when she was on duty as a police officer in Ohio. How did that knife turn up in California?