On the afternoon of Oct. 24, 1961, 31-year-old Joan Risch was found to be missing from her home in Lincoln, Massachusetts. Blood that matched her type was found in the kitchen and the driveway, a table had been overturned, and a telephone handset had been torn from the wall. Risch’s 2-year-old son was safe in his crib upstairs. Her husband, returning from a business trip, said he could not explain the source of some empty beer bottles in a wastebasket.

Risch had last been seen wearing a trench coat and carrying something red quickly up her driveway, toward the garage. Several people reported having seen a two-tone blue car in the neighborhood, and possibly in Risch’s driveway, at about the time of her disappearance, and a number of witnesses reported having seen a disoriented woman matching Risch’s description walking along nearby roads.

Some time after her disappearance, it was discovered that Risch had checked out 25 books on murders and missing-persons cases over the summer of 1961. The case has never been solved. Both Risch’s husband and police chief Leo Algeo died in 2009. Algeo said, “I thought they’d find a body or bones or something. … Things do turn up. People don’t disappear without a trace.”