Two plays and interlude by William M. Razavi Includes: The Sign of the Times, Mavis Davis and the Nighthawks at the Diner, and Nighthawks at the Diner: an Interlude. Follow the adventures of the hard boiled detective Mavis Davis as she explores problems both real and semiotic. There's no mystery too small and no problem too big for Mavis as she tries to get a handle on reality.