"Promise Not To Tell"

Two old (male) friends have arranged to meet up with two old girl school friends that they have not seen (collectively) since their school days, some forty five years previously.   However, the main character, Paul’s best friend, David, is holding a very dark secret from Paul; and the other two friends, the girls, are also aware of this concealed  “skeleton in the cupboard”.   The foursome meet in a seaside tea shop and things go well until Paul’s suspicions are aroused… and piece by piece, he begins to find flaws in the camouflaged cover story that has been fed to him until finally, he uncovers the hidden bombshell that has been concealed for over twenty years and he confronts each party concerned.