- The four members of I.C.U.R. Private Detectives (Isabel, Cameron, Unc and Rosie) are hot on the trail, solving another case - to find out who stole Madame Zena's crystal ball.
- They have their suspicions which just might involve a clumsy juggler, a scared lion tamer and an injured trapeze artist.
- Part of the Zapper Book Series 5.
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