Book of Time #2: Gate of Days (English, Paperback, Prevost Guillaume)

Sam Faulkner now knows his father is trapped in Vlad Tepes's castle, but he can't save him without the seven coins that will allow him to direct his travel to the right year in Time. So he sets off on a desperate journey through the ages to collect the coins-to the oracle at Delphi, to Pompeii before Mt. Vesuvius - even to Chicago in 1932, where he meets his seven-year-old grandfather. But things get wilder still when he finally finds his father, who is sick, dying, raving ... and who insists they must rescue Sam's dead mother from Time!