Arthur reviews the scant paperwork Jason and Byron compiled on David and fixates on a newspaper clipping: three hunters are charged for stalking and killing two adult yetis, illegal under the We Care Law. When David arrives for a scheduled talk, Arthur asks about David’s first day and his schooling, then shifts to what David wants to be when he grows up. David bluntly says he wants to be a monster, challenging Arthur’s instincts to reassure him away from that identity.

Arthur reframes David’s “monster” goal as something they can define together, emphasizing consent and intent in scaring versus harming. Using a playful example about frightening an accountant, Arthur connects learning and math to “better ways to scare people,” which makes David unexpectedly interested in school. Arthur then apologizes for not listening properly and promises David he can be whoever he wants at Marsyas. To help David integrate, Arthur assigns a “spy” mission: over the weekend, David should learn one interesting thing about each person in the house by talking to them.

On Saturday, Chauncey leads the weekly adventure: “yachting” on a shabby rowboat named Seas the Day. Everyone is dressed in wetsuits and life jackets, and Chauncey appoints David as captain, giving him a captain’s hat that the children treat as magical authority. David reluctantly accepts but grows confident, directing Sal and Phee as lookouts and assigning Theodore to watch for dangers, while he keeps morale up and even freezes Chauncey’s cooler when it melts.

Out at sea, Chauncey reveals a new talent: he can talk to fish. After the group calls for a fish named Frank, David’s powerful snarl helps draw Frank near, and Chauncey “translates” Frank’s comments. Chauncey argues that, since fish have names, they should stop eating seafood, but the truth emerges when Frank is seen swimming in Chauncey’s translucent stomach. Linus responds by making a new rule: no eating anything that has been given a name, and Chauncey regurgitates Frank back into the ocean.

As they prepare to return, the wind dies and the children must devise a plan without adult help. David proposes freezing the sea into stepping-stones, but the children choose Lucy’s more dramatic idea: Lucy summons a massive tidal wave that surges toward them. Chauncey improvises by stretching into a parachute, and the rowboat rides the wave and then flies toward shore; when the wind slows, Theodore blasts Chauncey with green fire to reinflate him like a hot-air balloon until they crash-land safely on the beach. Afterward, David admits he likes how weird everyone is, while Lucy stays angry at Arthur, implying Arthur’s earlier “monster” promise feels unequal.

Back at the house, Arthur sees trouble waiting: Zoe and Helen have DICOMY folders from Jeanine Rowder. Helen reads a notice to Mayor Webb announcing an official investigation beginning the third week of June, warning against interference with fines or incarceration. Zoe confirms an inspector arrives next Wednesday and that any deception will trigger the children’s immediate removal. Helen adds that reporters have flooded the village, but Merle is refusing to ferry them to the island; Arthur resolves to face the inspector and notes the reporters may become useful allies.