The Ghostly Groundskeeper (Tess and Tilly Mystery #12)

In book 12 in the series, Tony offers to pay for a televised ad promoting the annual haunted house, and Tess agrees to act as spokesperson. She shows up to film the piece and quickly discovers that the 'haunted' in haunted house was proving to be more real than imaginary. Join Tess and the gang as she decides to uncover the truth about former resident Doctor Franktown once and for all.