Twelve-year-old Meredith and ten-year-old Macy feel like the luckiest girls around.  Their mum is the General Manager of  The Ivy Hotel in Dublin, and they get to call it home.

Their modest apartment is tucked away in a corner, but it has lots of perks. The girls love spying on fancy events, sneaking treats from the restaurant and knowing all the secret stairs and corridors that guests never see, where the staff move around invisibly, making sure everything runs like clockwork...

This is going to come in handy. Because within the cosy walls of the Ivy Hotel, there is also danger, intrigue and threat. Just as the hotel's new owners arrive, ready to sniff out any excuse to make cuts and fire staff, the girls are faced with their biggest task yet: a murder to solve.