Coming October 20, 2026
A Party for Mousse

**From the author of A Day With Mousse, a New York Times Best Book of the Year**

In the fourth installment of Claire Lebourg's beloved series for early readers, Mousse learns that it doesn't matter where you spend the holidays, it's who you spend them with that counts.

The holiday season is here. Mousse has chosen and trimmed the perfect tree. Then he gets a call from his sister inviting him to spend Christmas with her and Pistachio in the big city. Crowds and tall buildings aren't his cup of tea (or coffee), but Mousse wants to see his family: he packs his bags. With his niece Pistachio as his guide, Mousse finds a little bit of home amid the wonders of the city.

As Christmas draws to a close, Mousse invites Pistachio to ring in the New Year. A quiet celebration, just the two of them and the sea. They return to Mousse's house to find a note from his old friend Barnacle on the door: he wants Mousse to host a new year's party, and will bring a few guests. Together, Mousse and Pistachio set out to cook for what they suspect will be more than a few guests. Then the doorbell rings and Mousse dons his party socks, prepared for what is sure to be an unforgettable celebration...