Not my favorite Miss Silver. The main character, Lisle Jerningham, has all of the personality and vitality of an overcooked noodle and Miss Silver hardly enters the story at all.
I do love the way that Miss Silver apparently governessed for every member of British law enforcement.
In the Balance was better than Grey Mask, but I preferred Lonesome Road, and this one recycled many of the same plot points. It was not good to be a young woman in control over a large fortune in Miss Silver's world.
The moral to the story: don't make a will. Or make a will leaving your entire fortune to the local pet rescue, so your family has an incentive to keep you alive.