Missing Since Monday (ISBN 978-0-8234-0626-5) is a book written by Ann M. Martin in 1986.

The story focuses on 16-year-old Maggie Ellis, the disappearance of her four-year-old sister Courtenay, and the subsequent effort to find the young girl.

Kirkus Reviews calls it "A fast-moving cautionary tale about kidnapping" and concludes "...enough suspense to hold readers.

"[1] Publishers Weekly described the book as "tense, gripping fare right up to the finale".

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