内容简介
Historyisbroken,andthreekidsmusttravelbackintimetosetitright!WhenbestfriendsDakSmythandSeraFrostestumbleuponasecretoftimetravel-ahand-helddeviceknownastheInfinityRing-they'resweptupinacenturies-longsecretwarforthefateofmankind.RecruitedbytheHystorians,asecretsocietythatdatesbacktoAristotle,thekidslearnthathistoryhasgonedisastrouslyoffcourse.Nowit'suptoDak,SeraandteenageHystorian-in-trainingRiqtotravelbackintimetofixtheGreatBreaks...andtosaveDak'smissingparentswhilethey'reatit.Firststop:Spain,1492,whereasailornamedChristopherColumbusisabouttobethrownoverboardinadeadlymutiny.