There are 2 books in the Loot series. The newest book is Sting which came out in 2016.

1
Loot

Book cover of Loot
"LOOT hits the jackpot." -- Rick Riordan, #1 New York Times bestselling author

On a foggy night in Amsterdam, a man falls from a rooftop to the wet pavement below. It's Alfie McQuinn, the notorious cat burglar, and he's dying. As sirens wail in the distance, Alfie manages to get…
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2
Sting

Book cover of Sting
Lock up your jewels! Bestselling author Jude Watson is back with her gang of kid criminal masterminds.

Never do a favor for a friend. Twelve-year-old March McQuin forgot rule number one for cat burglars, which is how he and his twin sister, Jules, found themselves dangling upside down twenty feet…