The Mouse Who Wouldn't Play Ball is a 1943 mystery thriller novel by the British writer Anthony Gilbert, the pen name of Lucy Beatrice Malleson.

It was the twelfth in a long-running series featuring her unscrupulous London lawyer Arthur Crook.

It was released in the United States the following year under the alternative title of Thirty Days to Live.

When his will is examined his greedily expectant relatives are shocked to discover they won't receive any money at all, as the entire estate passes to Dorothea Capper, a woman they've never heard of.

However to secure her inheritance she must spend thirty days in the house, despite a clear threat to her life.