Past Tense

Detectives Sloan and Crosby find themselves assigned two rather puzzling cases. First, there's the young woman's body which has been discovered in the River Alm. And then there's the mysterious break-in at the Berebury Nursing Home. To be precise, it's Josephine Short's room at the nursing home that's been entered, although nothing seems to be missing. What could the intruder have been after? It becomes apparent to Sloan and Crosby that the two cases are connected--but who can the killer be?