In Alex Gray's The Stalker, DS Lorimer has two murders, that could be linked,  on his hands. Meanwhile, his wife Maggie has written a children's book and is embarking on a promotional tour during the Easter holidays (she is a teacher by profession).
She begins to receive strange telephone calls and messages, but doesn't want to worry her husband by telling him about them.
This was an enjoyable whodunnit (book 16 in the Lorimer series) although, Maggie's tendancy  to trust everyone and take everything at face value didn't ring true,  especially with her being married to the head of the murder unit.