More like Double Trouble Squared

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Starbuck Family AdventuresSeries
series3 books1991
Set in north america.
“July and Liberty Starbuck, twins, and their family are busy exploring the streets of London where their father has accepted a new job.”
from the catalogue
Start with Double Trouble Squared →
The London Eye MysteryNovel
Siobhan Dowdstandalone novel2007
Whodunit, about friendship.
“In 2017, Robin Stevens published a sequel, The Guggenheim Mystery.”
from the catalogue
Gilda JoyceSeries
series5 books2005
About murder investigation, set in north america.
Start with Gilda Joyce, Psychic Investigator →
The Thirteenth TaleNovel
Diane Setterfieldstandalone novel2006
Gothic, eerie in tone, about identity.
The Left-Handed Booksellers of LondonSeries
series2 books2020
Urban fantasy.
“Garth Nix's The Left-Handed Booksellers of London is set in a slightly alternate 1983 London, where Susan Arkshaw searches for the father she's never met.”
from the catalogue
Start with The Left-Handed Booksellers of London →
North of NowhereNovel
Liz Kesslerstandalone novel2013
Set in small town.