When Liz was about to find out who killed Mario, she fell asleep. When she woke up she realized that she could no longer find it out.
Liz was reading a novel on the beach. The main character, Mario, had been killed and she was about to find out who had committed the crime. Before she found it out, she fell asleep with the book lying in the sand. When she woke up she saw that the tide had risen and the book had been washed away.