Fraud analysis on a lender's own loan book.

Bookrule is for the fraud and data analysts inside a lender. Load the loan book and it finds loans that stopped paying on the first instalments and incomes that pile up inside an underwriting cut-off. It checks that payments reconcile and, with payment history loaded, reads repayment month by month.

Flagged loans are ranked by a review score. Each opens to its evidence and the most likely explanation, and once analysts have marked twenty loans with a reason, their marks move that reason's weight in the ranking.