Nik Tyler

Caroline and Max throw a '90s-themed party at the diner to attract rich hipsters and raise money for their cupcake business. Caroline is horrified when her rich ex-boyfriend, William (guest star TRAVIS VAN WINKLE -- 90210, Friday the 13th), comes into the diner.

When Langston and Nick are called in to investigate a murder at a fast-food restaurant, they soon discover they have a tricky task ahead of them when they find the evidence covered in cooking oil.