Hey, what is this, he asked.
I guess maybe you could call it like love, Caroline said.
Whaddaya mean, love? Chet asked. Your contract expressly forbids you to fall in love during the duration of your tenth kill, and it furthermore explicitly forbids you to fall in love with your Victim.
Love, Caroline said coolly, existed a long time before contracts.
Contracts, Martin said viciously, are a lot more enforceable than love.
Chapter 16 (pp. 136-137) - The 10th Victim (1965)