Actually 3.5 stars. I enjoyed the first half of this book much more, in which a series of unreliable narrators lay out the troubled household of Margaret and George Harrison, her companion Aggie, and their upstairs tenants, artist Haworth Lathom and writer John Munting. ‘The Documents in the Case’ starts out as an epistolary novel and as inconsistencies in their accounts pile up, it slowly occurs to the reader that some or all of the letter-writers may be undependable, or at least they have conflicting perspectives. George’s unusual hobby is foraging for unusual foods, particularly mushrooms, with predictable consequences. The second half proceeds as a written account of a murder investigation conducted by Munting and George Harrison’s son from his first marriage, Paul. The character Aggie completely disappears with little explanation, which is odd since hers is the first voice we hear and she’s the first to give us insight into the relationships among the various members of the household. The investigation turns on the science of synthetic poisons and their introduction into food; the “documents” relating to the science try to derive their drama from the novelty, but I missed the household intrigue and emotional interplay. Not one of Sayers’ best, but still an unusual mystery that was worth the time.