London, 1912: a police investigation into the extraordinary and often dangerous world of the circus!

Young Collins seizes upon the arrival of the Circus Amicus to earn a few pence. But the lion and the bear mysteriously vanish. A ransom letter is received, and the circus finds its future in peril! A resourceful boy, Collins soon turns up a few clues. From the magician to the clown to Monsieur Loyal, who is behind this Machiavellian conspiracy?