One Mixed-up Night by Catherine Newman

Frankie and Walter have always loved IKEA.  They love to play the "picking game" with the IKEA catalog.  They love to imagine living in one of the mini demo houses.  Then one day when both of their families are planning to visit IKEA together, they hatch a plan to stay back and spend the night in IKEA just like the kids in the book, "From the Mixed Up Files of Mrs. Basil E. Frankweiler." Their ploy of telling their parents that they are each staying at the other's for a sleepover works, and they find themselves alone in their favorite place for the night.  While there they have adventures, and finally talk about the hidden grief that has been plaguing them both.

This is a fun and tender book about friendship and grief.  It is also a bit of a wish-fulfillment book, because what kid hasn't dreamed of spending the night in a department store? Parents will cringe at the amount of destruction the kids cause with their antics, but Newman glosses over consequences. It will be easy to recommend this book to kids.  (2017, 191 p.)

P.S.
You know how it seems that every children's book now has to have a GBLT reference to get published.  Well, Newman was very creative with her little reference.  Frankie and Walter both have cats as pets.  At the beginning of the book they imagine their cats getting married, both dressed in tuxedos, because they are both boy cats.  Total eye role!