"...full of action and intriguing concepts and possibilities. . . .The short chapters may appeal to reluctant readers. This sci-fi foray is sure to be embraced by kids who once relished the time-traveling adventures in Mary Pope Osborne's "Magic Tree House" series (Random) or Jon Scieszka's "Time Warp Trio" (Penguin) and those who enjoy the "Infinity Ring."
School Library Journal
"...a fast-paced and entertaining novel. . . .readers should be drawn into the siblings' comical misadventures as they investigate whether an alchemist is trying to pull a fast one over on the Holy Roman Emperor."
Publishers Weekly
"In sharp contrast to most authors who try their hand at time-travel tales, Seven has plainly thought out consistent and (reasonably) plausible ways for his characters to interact with the past without causing paradoxes or catastrophic changes to the future. . . .A flying start for a series that puts in a strong bid for Magic Treehouse grads."
