Helping C.I.D. this time in similar fashion to the way earlier Doctors helped UNIT, the Doctor starts out at the end of foiling a nefarious plan of the Master's. There are elements that are carried forward from the Virgin Missing Adventure The Scales of Injustice by the same author but it's not essential to have read that book to enjoy this one. Whenever I come across a reference to Business Unusual I think of the 'Doctor gets burger' scene. I can just imagine Colin Baker playing that scene for all it's worth. Brilliant. Actually all of the Doctor's scenes are good. I loved the idea of a Time Lord desperate to avoid his future in the shape of a certain carrot juice swilling redhead from Pease Pottage. Oh, and the Brig's in it. What more could you want?