Once Upon An Iceberg by Sheilah Lukins
When the dog’s away, the mice go on an adventure!
Errol is off on another adventure! With his new-found friend Gus, Errol travels to Twillingate to help search for Gus’s father. In the course of his search, he finds treasures on the beach, almost floats away with the icebergs, and visits the Long Point Lighthouse. There he meets Olivia and her family, who help him on his quest, showing him around and hunting for clues. But time is running out; they have to head home to Beachy Cove—and there’s still no sign of Gus’s dad!