Valentyne has lived many lives - physician, philosopher, soldier - but his defining work has been his ability to stop the clock. He has lived for centuries, as has his dog, Tomorrow.

Inseparable, they've voyaged across Europe, using their time wisely. They've attended royalty in a dozen courts, healed soldiers on a hundred battlefields, and met with the greatest minds of the Renaissance. Until one day, in watery Venice, Valentyne vanishes without trace.

Broken-hearted, Tomorrow begins a search that will endure for centuries. But as the continent collapses into war, he must risk everything to find his master - or lose him forever.