Harvard Kendal was a serial killer who murdered seven women in the San Fernando Valley , all of whom were beauty shop owners or employees. He used a sharpened nail file to slash their throats, earning him the nickname of The Beauty Shop Slasher. He had previously committed a series of beauty shop arsons in Oakland in the 1960s.
Kendal's mother had been a beautician who had practiced her craft on her young son, causing psychologists to assume that he had internalized this emasculation. Police discovered Kendal's identity when they found a license plate number written by his seventh victim the day before she was killed. Harry Bosch and his partner at the time were able to arrest Kendal.
- The Black Echo (mentioned)