Potkin and Stubbs. The secret of the boy-guide

Lil Potkin always dreamed of becoming a cool detective and finally establish justice in Peligan. But no one has ever perceived her seriously. Well, of course, she is just a teenage girl! But one day, life has changed abruptly. A truly confusing business fell into her hands. A random passerby, a guy named Nedly Stubbs, asked her for help. But this is the mystery: no one except pouring, Ned sees. A terrible cold comes from him, and he easily passes through the walls. There is only one explanation for all this: Ned is a ghost! And it seems that he died under very mysterious circumstances. Which ones? This is Lil and have to find out! The first book of the series.