Washed-up archaeologist Rip Digman, trying to dig out of obscurity and redeem himself, recruits a sidekick to help him find the lost hat of Hammurabi, an ancient king of Babylon.

Rip, Saltine, and Swooper travel to Venice to look for a historical batch of confetti, but find themselves embroiled in a mystery involving secret organizations, curses, gondoliers, and the knife Brutus used to kill Caesar.

Rip and Saltine attend the Arky Gala, the most glamorous event of the year, where Saltine makes an unlikely friend. But their reverie is shattered when the gala is taken hostage by a ragtag group of criminals.

Rip goes on an undercover mission to find a long-lost sonnet from Shakespeare's legendary oeuvre, but things get sticky when he crosses paths with a charming thespian.

Rip journeys to the distant Puffland in pursuit of the Holy Grail to resurrect his late wife Bella, but his solo mission goes awry when the king arranges for Rip to marry his daughter.

Rip infiltrates Quail's museum opening to steal the Holy Grail and bring Bella back to life, and Saltine goes on a risky mission to find out the truth about the coveted artifact.