'Romp' in this sense - great tale, rollicking story, narrative that zips along with plenty of surprise developments, twists and turns all the way to thrill the reader.

Don't tell me!!!

It's a mystery too

And there are lots of characters.

Must be the baddies that do it - unless you find the homoerotic undercurrent of tension between the tights-clad hero and his sweet little 'boy-wonder' (I do wonder indeed) riveting.