Eight-year-old twins Josh and Danny continue their adventures as test subjects in their neighbor's mad experiment. Miss Potts has developed S.W.I.T.C.H. spray, which temporarily changes people into insects and animals. These undemanding books rely on humor and suspense to capture readers' attention. The black-and-white drawings help bring the preposterous plots to life. There are four other spring 2014 books in this series. Reading list, websites. Glos.