The Lady Grace Mysteries, Deception Novel Synopsis 13

This is the diary of Grace Cavendish, a 13 year old girl in London in the 1800's. She is the maid of honour of Queen Elizabeth I. In the book is doesn't say who the author is, and at the end it says that Grace Cavendish is a fictional character, but some other people in the book were real.
Lady Grace lives in the majesty's castle, and she shares her room with two other maids of honour, Lady Sarah and Mary Shelton. The reason why Mary is not Lady Mary is because you have to born into a Lady and seeing as no one from Mary's family was a Lady she will not be either. The river Thames has frozen over and Lady Grace can't wait to skate down to the Frost Fair on the lake. But the dead body of a man, with the Queen's new currency stuffed in his eyes interrupts the festivity. Lady Grace needs to find out who it was, and the Queen allows her 5 days to find something, otherwise she will hire detectives. Lady Grace get her two best friends Ellie and Masou to come and help her. They go out at night searching for clues for 3 nights. Lady Grace has only one chance left, and by PURE luck on the last night they find the master mint, Sir Edward exchanging some forged coins with another man. Sir Edward sees them and he locks all three in a dark cramped closet. Lady Grace, Ellie and Masou manage to escape but they don't have long before someone notices. They run straight to the Queen who immediately believes them, and she sends guards to arrest Sir Edward. The Queen forgets about making a new currency and rewards the kids with gowns and toys.