Like Jonathan Kellerman, I have probably read most of Mary Higgins Clark’s books except for the newer ones.
I am not sure if she is still the one writing her books though because the series by Lawrence Sanders that I Also love to read is being written by another author.
Anyway, the plot in Just Take my Heart like other MHC books, have characters that were introduced one at a time. They may be seemingly unrelated to the central character but towards a third of a fourth of the book, everything will fall into place. This book though, for me seems to have taken a slow pace.
Spoiler: The title also has a literal meaning in the plot but it has nothing to do with murder or heartbreak.