THE WRECK AND RISE OF WHITSON MARINER ARE AHEAD; CAUTION IS ADVISED.
A rabbit of few words, Grimble received his captaincy as part of an effort by King Whitson Mariner to make peace with his father Lord Grimble. After Lillie and Natalia were built, he was named skipper of Vanguard. Fleck Blackstar later observed him in whispered conference with his father aboard ship.
Aboard the Vanguard, King Whitson Mariner welcomes his lords and captains into his cabin for a toast. Whitson engages in a heated exchange with Lord Grimble and Captain Grimble, prompting Queen Lillie to quell the rising storm by calling for a toast. Lord and Captain Grimble toast for "a new kingdom", which so riles Whitson that Lillie is forced to take him out of the room before his temper can further elevate.
Under Captain Grimble's command, Burnley failed to warn Vanguard of a rock that wrecked the vessel, and disappeared failing to answer hails. It is later revealed that the Grimbles have betrayed their king by leading him into a wreck on a mysterious island inhabited by dragons, with whom the Grimbles have allied.