Harvey Halifax lives on Chronus, an island dominated by an elaborate clock tower. When he returns to Chronus after a trip abroad, he discovers that everyone else on the island is frozen – not in ice, but in time.
Harvey is sure the freeze has something to do with an old Chronus nursery rhyme and a numeral that's missing from the clock face. Now, assisted by a battered clockwork automaton named Steelsides, Harvey must find the numeral and set things right in Chronus.
Harvey is Chronus’s last hope – but if he doesn't work fast, he's going to freeze too, and Chronus will be lost to time forever.