Katherine Lyon was 10 when she and her 12-year-old sister Sheila were last seen leaving Wheaton Plaza Shopping Center in Wheaton, Maryland, on March 25, 1975. The girls had gone to see the Easter exhibits and have lunch and were last seen about 2 p.m. walking home from the mall; they never arrived.

Their disappearance triggered one of the largest missing-person searches in the state, with hundreds of volunteers and multiple law enforcement agencies involved. Early efforts produced no immediate leads and the case went cold for many years, though it later drew renewed investigative attention and multiple persons of interest were considered.

What details about that afternoon or the route from the mall to the girls’ home might still help fill the gaps in the timeline? If anyone remembers seeing Katherine or Sheila that day or has information about the Wheaton Plaza area in March 1975, please share what is known.