I read this book ten times when I was a kid. There are four teenagers who are into mysteries and stuff - no big deal there. One of them, I seem to remember has a dad who is a spy - again, heard it all before. The characters, though, are really quirkily drawn, especially this 7 foot kid called Bo. Anyway, the four lads stumble across some dastardly plan to send everyone to sleep - I think - get hoodwinked by the baddies, have an escapade with a lion, and all sorts of other cool stuff. Man, I'm gunna buy this book again; it's twenty years since I read it!