What's the Name of That Book??? discussion

This topic is about
Little Darlings
SOLVED: Children's/YA
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SOLVED. 3 kids go with a nanny agency that's a cover for a large thieving organisation. [s]
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Books mentioned in this topic
Little Darlings (other topics)Nanny X (other topics)
I just remember curious details, but I can't find it for some reason.
The story goes something like this:
The 3 kids living in the house all has their own skills to do mischievous deeds and all. One day, their rich parents got a new nanny hire, and left before the nanny came. The nanny came around on a car.
At night, a kid tried to ask for a kiss or something like that, and stole her car keys, had them replicated.
The three children entered the car, wanting to play around. The nanny was later revealed to be a thief, and stole - a "bear's head" if i recall, one of 8 body parts..? worth a lot..? and they drove away.
way later into the book, or maybe another series, the 3 kids were part of the agency. They tried to get access onto a ship. One of the kids stole the access papers by going with another girl into the toilet, saying they wanted to try each other's clothes, then just ran away with the clothes(and papers in the pockets)
Another kid challenged a crew member to skate boarding, and when reaching a car, he said under. Crew said it was impossible, kid taunted him. The car was too low down, and crew was knocked out. kid took the papers.
That's about all i remember. Thanks in advance!