Home from college for the summer, Jean and Jared find disturbing changes in the tiny community of Warm Springs. Something suspicious is going on in HybriGene's top-secret laboratory. The twins make it their business to solve the mystery. Written specifically for struggling readers to explore genres, like mysteries and science fiction, these fast-paced books hold student interest until the last page. Questions at the end of each title promote cognitive development by making students think about vocabulary, comprehension, character, and plot.