Passage: Following the Yellowstone fires of 1988, Henry (Rich Sommer) takes a job as a fire lookout in Wyoming after his wife develops advanced early-onset dementia. On his first day, Delilah (Cissy Jones), a lookout in another watchtower, contacts him via walkie-talkie and asks him to investigate illegal fireworks by the lake. Henry discovers a pair of drunken teenage girls, who accuse him of leering. On his way home he comes across a locked cave and spots a shadowy figure watching him. He returns to his watchtower to find it ransacked. The next day, Delilah asks Henry to investigate a downed communication line. He finds it cut, with a note apparently signed by the teens. He and Delilah plot to scare the girls off, but when he finds the girls' campsite ransacked and abandoned, they begin to worry. A note left at the site blames Henry for wrecking their camp and stealing their belongings.

Question: When did Delilah request Henry for an investigation?
next day