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Cleanly sliced into two parts, this spare novel of complicated ambitions — personal, professional and familial — pits three people against their perceived places in the world as well as their rarely acknowledged shadow selves.

She added many did not have familial support, which was "unusual for a small rock".

The use of familial DNA search is not the only advancement in forensics, says Jo, the sample size needed to get a full DNA profile has also changed dramatically.

"It's often the case that the exact familial tie can't be traced, but the gene occurs more commonly within a certain group, and for that reason, both parents carry the affected gene," Prof Oddie says.

Love comes in many forms — platonic friendships, familial bonds and even professional partnerships.