This novel was withdrawn from the Rose Bay High School and still offers a good read. I found it at Vinnies. Detective Sergeant Day has vanished under mysterious circumstances. The police have been tipped off that he has been taking bribes and now he is on the wanted list. However, the Baker Street Irregulars, a group of friends, are not totally convinced. They suddenly find that they have their hands full solving the mysterious disappearance of their friend Detective-Sergeant Day as well as jewel theft, a series of truck hijackings, a missing person case, and a traffic violation when a yacht gets sailed into a seawall. Boy are they busy!