Inspector French and the Starvel Tragedy

The burning down of Simon Averill's house, Starvel Hollow, appears at first to be an accident. The house has been reduced to ash, killing three people (including its owner) and incinerating the contents of the safe in which he kept his entire fortune in cash (over thirty thousand pounds). But when one of these notes appears in circulation, surely it cannot be an accident? Once again, Inspector French doggedly pursues the trail across Europe before finally unlocking the mystery when all appears to be lost.