Every suspect is hiding a secret. Let me repeat for emphasis: EVERY SUSPECT IS HIDING A SECRET. It’s just that only one of them is hiding THE secret. The others don’t want your hero uncovering that they’ve stolen family heirlooms, was responsible for the happy couple’s break-up, dealing drugs, burned down the school building, pirating cable TV. Part of the fun of reading a murder mystery is unraveling the sordid lives of the suspect line-up.
So what makes a good suspect?
If ultimately the murderer is proven to have motive, means and opportunity, a viable suspect should have one or two of these attributes, but not all three. The obvious suspect will have “motive.” (She stood up in a crowded theater and announced her vow to make sure that the victim wouldn’t live to see the light of another day just hours before the murder occurred.) The suspect with “means” just happens to own the murder weapon, and the one with “opportunity” was at the wrong place at the wrong time. However, upon investigation, everyone of these attributes point to something else entirely – something that’s probably scandalous and juicy.
So how many suspects should be standing in the line-up?
That can be a little tricky. There’s got to be enough suspects to ensure that the murderer’s identity is a surprise, but not so many that the poor, confused reader can’t keep up. Three is the minimum (see above) but, if the story calls for it, that line-up can stretch to four or five.
Show me a good suspect, and I’ll show you a good liar.
At least one, if not all, should be lying through his teeth. He is feeding the sleuth (and the reader) false information that leads them looking in the wrong direction. Obviously he’s lying to keep a secret hidden, but could also be protecting a reputation or a family member. Protection makes a believable motive for deception. And, when his lie is revealed, it makes a great twist in the book and places this suspect in the spotlight.
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